diff --git a/vendor/github.com/fatih/structs/structs.go b/vendor/github.com/fatih/structs/structs.go
new file mode 100644
index 0000000..3a87706
--- /dev/null
+++ b/vendor/github.com/fatih/structs/structs.go
@@ -0,0 +1,584 @@
+// Package structs contains various utilities functions to work with structs.
+package structs
+
+import (
+	"fmt"
+
+	"reflect"
+)
+
+var (
+	// DefaultTagName is the default tag name for struct fields which provides
+	// a more granular to tweak certain structs. Lookup the necessary functions
+	// for more info.
+	DefaultTagName = "structs" // struct's field default tag name
+)
+
+// Struct encapsulates a struct type to provide several high level functions
+// around the struct.
+type Struct struct {
+	raw     interface{}
+	value   reflect.Value
+	TagName string
+}
+
+// New returns a new *Struct with the struct s. It panics if the s's kind is
+// not struct.
+func New(s interface{}) *Struct {
+	return &Struct{
+		raw:     s,
+		value:   strctVal(s),
+		TagName: DefaultTagName,
+	}
+}
+
+// Map converts the given struct to a map[string]interface{}, where the keys
+// of the map are the field names and the values of the map the associated
+// values of the fields. The default key string is the struct field name but
+// can be changed in the struct field's tag value. The "structs" key in the
+// struct's field tag value is the key name. Example:
+//
+//   // Field appears in map as key "myName".
+//   Name string `structs:"myName"`
+//
+// A tag value with the content of "-" ignores that particular field. Example:
+//
+//   // Field is ignored by this package.
+//   Field bool `structs:"-"`
+//
+// A tag value with the content of "string" uses the stringer to get the value. Example:
+//
+//   // The value will be output of Animal's String() func.
+//   // Map will panic if Animal does not implement String().
+//   Field *Animal `structs:"field,string"`
+//
+// A tag value with the option of "flatten" used in a struct field is to flatten its fields
+// in the output map. Example:
+//
+//   // The FieldStruct's fields will be flattened into the output map.
+//   FieldStruct time.Time `structs:",flatten"`
+//
+// A tag value with the option of "omitnested" stops iterating further if the type
+// is a struct. Example:
+//
+//   // Field is not processed further by this package.
+//   Field time.Time     `structs:"myName,omitnested"`
+//   Field *http.Request `structs:",omitnested"`
+//
+// A tag value with the option of "omitempty" ignores that particular field if
+// the field value is empty. Example:
+//
+//   // Field appears in map as key "myName", but the field is
+//   // skipped if empty.
+//   Field string `structs:"myName,omitempty"`
+//
+//   // Field appears in map as key "Field" (the default), but
+//   // the field is skipped if empty.
+//   Field string `structs:",omitempty"`
+//
+// Note that only exported fields of a struct can be accessed, non exported
+// fields will be neglected.
+func (s *Struct) Map() map[string]interface{} {
+	out := make(map[string]interface{})
+	s.FillMap(out)
+	return out
+}
+
+// FillMap is the same as Map. Instead of returning the output, it fills the
+// given map.
+func (s *Struct) FillMap(out map[string]interface{}) {
+	if out == nil {
+		return
+	}
+
+	fields := s.structFields()
+
+	for _, field := range fields {
+		name := field.Name
+		val := s.value.FieldByName(name)
+		isSubStruct := false
+		var finalVal interface{}
+
+		tagName, tagOpts := parseTag(field.Tag.Get(s.TagName))
+		if tagName != "" {
+			name = tagName
+		}
+
+		// if the value is a zero value and the field is marked as omitempty do
+		// not include
+		if tagOpts.Has("omitempty") {
+			zero := reflect.Zero(val.Type()).Interface()
+			current := val.Interface()
+
+			if reflect.DeepEqual(current, zero) {
+				continue
+			}
+		}
+
+		if !tagOpts.Has("omitnested") {
+			finalVal = s.nested(val)
+
+			v := reflect.ValueOf(val.Interface())
+			if v.Kind() == reflect.Ptr {
+				v = v.Elem()
+			}
+
+			switch v.Kind() {
+			case reflect.Map, reflect.Struct:
+				isSubStruct = true
+			}
+		} else {
+			finalVal = val.Interface()
+		}
+
+		if tagOpts.Has("string") {
+			s, ok := val.Interface().(fmt.Stringer)
+			if ok {
+				out[name] = s.String()
+			}
+			continue
+		}
+
+		if isSubStruct && (tagOpts.Has("flatten")) {
+			for k := range finalVal.(map[string]interface{}) {
+				out[k] = finalVal.(map[string]interface{})[k]
+			}
+		} else {
+			out[name] = finalVal
+		}
+	}
+}
+
+// Values converts the given s struct's field values to a []interface{}.  A
+// struct tag with the content of "-" ignores the that particular field.
+// Example:
+//
+//   // Field is ignored by this package.
+//   Field int `structs:"-"`
+//
+// A value with the option of "omitnested" stops iterating further if the type
+// is a struct. Example:
+//
+//   // Fields is not processed further by this package.
+//   Field time.Time     `structs:",omitnested"`
+//   Field *http.Request `structs:",omitnested"`
+//
+// A tag value with the option of "omitempty" ignores that particular field and
+// is not added to the values if the field value is empty. Example:
+//
+//   // Field is skipped if empty
+//   Field string `structs:",omitempty"`
+//
+// Note that only exported fields of a struct can be accessed, non exported
+// fields  will be neglected.
+func (s *Struct) Values() []interface{} {
+	fields := s.structFields()
+
+	var t []interface{}
+
+	for _, field := range fields {
+		val := s.value.FieldByName(field.Name)
+
+		_, tagOpts := parseTag(field.Tag.Get(s.TagName))
+
+		// if the value is a zero value and the field is marked as omitempty do
+		// not include
+		if tagOpts.Has("omitempty") {
+			zero := reflect.Zero(val.Type()).Interface()
+			current := val.Interface()
+
+			if reflect.DeepEqual(current, zero) {
+				continue
+			}
+		}
+
+		if tagOpts.Has("string") {
+			s, ok := val.Interface().(fmt.Stringer)
+			if ok {
+				t = append(t, s.String())
+			}
+			continue
+		}
+
+		if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
+			// look out for embedded structs, and convert them to a
+			// []interface{} to be added to the final values slice
+			t = append(t, Values(val.Interface())...)
+		} else {
+			t = append(t, val.Interface())
+		}
+	}
+
+	return t
+}
+
+// Fields returns a slice of Fields. A struct tag with the content of "-"
+// ignores the checking of that particular field. Example:
+//
+//   // Field is ignored by this package.
+//   Field bool `structs:"-"`
+//
+// It panics if s's kind is not struct.
+func (s *Struct) Fields() []*Field {
+	return getFields(s.value, s.TagName)
+}
+
+// Names returns a slice of field names. A struct tag with the content of "-"
+// ignores the checking of that particular field. Example:
+//
+//   // Field is ignored by this package.
+//   Field bool `structs:"-"`
+//
+// It panics if s's kind is not struct.
+func (s *Struct) Names() []string {
+	fields := getFields(s.value, s.TagName)
+
+	names := make([]string, len(fields))
+
+	for i, field := range fields {
+		names[i] = field.Name()
+	}
+
+	return names
+}
+
+func getFields(v reflect.Value, tagName string) []*Field {
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	t := v.Type()
+
+	var fields []*Field
+
+	for i := 0; i < t.NumField(); i++ {
+		field := t.Field(i)
+
+		if tag := field.Tag.Get(tagName); tag == "-" {
+			continue
+		}
+
+		f := &Field{
+			field: field,
+			value: v.FieldByName(field.Name),
+		}
+
+		fields = append(fields, f)
+
+	}
+
+	return fields
+}
+
+// Field returns a new Field struct that provides several high level functions
+// around a single struct field entity. It panics if the field is not found.
+func (s *Struct) Field(name string) *Field {
+	f, ok := s.FieldOk(name)
+	if !ok {
+		panic("field not found")
+	}
+
+	return f
+}
+
+// FieldOk returns a new Field struct that provides several high level functions
+// around a single struct field entity. The boolean returns true if the field
+// was found.
+func (s *Struct) FieldOk(name string) (*Field, bool) {
+	t := s.value.Type()
+
+	field, ok := t.FieldByName(name)
+	if !ok {
+		return nil, false
+	}
+
+	return &Field{
+		field:      field,
+		value:      s.value.FieldByName(name),
+		defaultTag: s.TagName,
+	}, true
+}
+
+// IsZero returns true if all fields in a struct is a zero value (not
+// initialized) A struct tag with the content of "-" ignores the checking of
+// that particular field. Example:
+//
+//   // Field is ignored by this package.
+//   Field bool `structs:"-"`
+//
+// A value with the option of "omitnested" stops iterating further if the type
+// is a struct. Example:
+//
+//   // Field is not processed further by this package.
+//   Field time.Time     `structs:"myName,omitnested"`
+//   Field *http.Request `structs:",omitnested"`
+//
+// Note that only exported fields of a struct can be accessed, non exported
+// fields  will be neglected. It panics if s's kind is not struct.
+func (s *Struct) IsZero() bool {
+	fields := s.structFields()
+
+	for _, field := range fields {
+		val := s.value.FieldByName(field.Name)
+
+		_, tagOpts := parseTag(field.Tag.Get(s.TagName))
+
+		if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
+			ok := IsZero(val.Interface())
+			if !ok {
+				return false
+			}
+
+			continue
+		}
+
+		// zero value of the given field, such as "" for string, 0 for int
+		zero := reflect.Zero(val.Type()).Interface()
+
+		//  current value of the given field
+		current := val.Interface()
+
+		if !reflect.DeepEqual(current, zero) {
+			return false
+		}
+	}
+
+	return true
+}
+
+// HasZero returns true if a field in a struct is not initialized (zero value).
+// A struct tag with the content of "-" ignores the checking of that particular
+// field. Example:
+//
+//   // Field is ignored by this package.
+//   Field bool `structs:"-"`
+//
+// A value with the option of "omitnested" stops iterating further if the type
+// is a struct. Example:
+//
+//   // Field is not processed further by this package.
+//   Field time.Time     `structs:"myName,omitnested"`
+//   Field *http.Request `structs:",omitnested"`
+//
+// Note that only exported fields of a struct can be accessed, non exported
+// fields  will be neglected. It panics if s's kind is not struct.
+func (s *Struct) HasZero() bool {
+	fields := s.structFields()
+
+	for _, field := range fields {
+		val := s.value.FieldByName(field.Name)
+
+		_, tagOpts := parseTag(field.Tag.Get(s.TagName))
+
+		if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
+			ok := HasZero(val.Interface())
+			if ok {
+				return true
+			}
+
+			continue
+		}
+
+		// zero value of the given field, such as "" for string, 0 for int
+		zero := reflect.Zero(val.Type()).Interface()
+
+		//  current value of the given field
+		current := val.Interface()
+
+		if reflect.DeepEqual(current, zero) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Name returns the structs's type name within its package. For more info refer
+// to Name() function.
+func (s *Struct) Name() string {
+	return s.value.Type().Name()
+}
+
+// structFields returns the exported struct fields for a given s struct. This
+// is a convenient helper method to avoid duplicate code in some of the
+// functions.
+func (s *Struct) structFields() []reflect.StructField {
+	t := s.value.Type()
+
+	var f []reflect.StructField
+
+	for i := 0; i < t.NumField(); i++ {
+		field := t.Field(i)
+		// we can't access the value of unexported fields
+		if field.PkgPath != "" {
+			continue
+		}
+
+		// don't check if it's omitted
+		if tag := field.Tag.Get(s.TagName); tag == "-" {
+			continue
+		}
+
+		f = append(f, field)
+	}
+
+	return f
+}
+
+func strctVal(s interface{}) reflect.Value {
+	v := reflect.ValueOf(s)
+
+	// if pointer get the underlying element≤
+	for v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	if v.Kind() != reflect.Struct {
+		panic("not struct")
+	}
+
+	return v
+}
+
+// Map converts the given struct to a map[string]interface{}. For more info
+// refer to Struct types Map() method. It panics if s's kind is not struct.
+func Map(s interface{}) map[string]interface{} {
+	return New(s).Map()
+}
+
+// FillMap is the same as Map. Instead of returning the output, it fills the
+// given map.
+func FillMap(s interface{}, out map[string]interface{}) {
+	New(s).FillMap(out)
+}
+
+// Values converts the given struct to a []interface{}. For more info refer to
+// Struct types Values() method.  It panics if s's kind is not struct.
+func Values(s interface{}) []interface{} {
+	return New(s).Values()
+}
+
+// Fields returns a slice of *Field. For more info refer to Struct types
+// Fields() method.  It panics if s's kind is not struct.
+func Fields(s interface{}) []*Field {
+	return New(s).Fields()
+}
+
+// Names returns a slice of field names. For more info refer to Struct types
+// Names() method.  It panics if s's kind is not struct.
+func Names(s interface{}) []string {
+	return New(s).Names()
+}
+
+// IsZero returns true if all fields is equal to a zero value. For more info
+// refer to Struct types IsZero() method.  It panics if s's kind is not struct.
+func IsZero(s interface{}) bool {
+	return New(s).IsZero()
+}
+
+// HasZero returns true if any field is equal to a zero value. For more info
+// refer to Struct types HasZero() method.  It panics if s's kind is not struct.
+func HasZero(s interface{}) bool {
+	return New(s).HasZero()
+}
+
+// IsStruct returns true if the given variable is a struct or a pointer to
+// struct.
+func IsStruct(s interface{}) bool {
+	v := reflect.ValueOf(s)
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	// uninitialized zero value of a struct
+	if v.Kind() == reflect.Invalid {
+		return false
+	}
+
+	return v.Kind() == reflect.Struct
+}
+
+// Name returns the structs's type name within its package. It returns an
+// empty string for unnamed types. It panics if s's kind is not struct.
+func Name(s interface{}) string {
+	return New(s).Name()
+}
+
+// nested retrieves recursively all types for the given value and returns the
+// nested value.
+func (s *Struct) nested(val reflect.Value) interface{} {
+	var finalVal interface{}
+
+	v := reflect.ValueOf(val.Interface())
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	switch v.Kind() {
+	case reflect.Struct:
+		n := New(val.Interface())
+		n.TagName = s.TagName
+		m := n.Map()
+
+		// do not add the converted value if there are no exported fields, ie:
+		// time.Time
+		if len(m) == 0 {
+			finalVal = val.Interface()
+		} else {
+			finalVal = m
+		}
+	case reflect.Map:
+		// get the element type of the map
+		mapElem := val.Type()
+		switch val.Type().Kind() {
+		case reflect.Ptr, reflect.Array, reflect.Map,
+			reflect.Slice, reflect.Chan:
+			mapElem = val.Type().Elem()
+			if mapElem.Kind() == reflect.Ptr {
+				mapElem = mapElem.Elem()
+			}
+		}
+
+		// only iterate over struct types, ie: map[string]StructType,
+		// map[string][]StructType,
+		if mapElem.Kind() == reflect.Struct ||
+			(mapElem.Kind() == reflect.Slice &&
+				mapElem.Elem().Kind() == reflect.Struct) {
+			m := make(map[string]interface{}, val.Len())
+			for _, k := range val.MapKeys() {
+				m[k.String()] = s.nested(val.MapIndex(k))
+			}
+			finalVal = m
+			break
+		}
+
+		// TODO(arslan): should this be optional?
+		finalVal = val.Interface()
+	case reflect.Slice, reflect.Array:
+		if val.Type().Kind() == reflect.Interface {
+			finalVal = val.Interface()
+			break
+		}
+
+		// TODO(arslan): should this be optional?
+		// do not iterate of non struct types, just pass the value. Ie: []int,
+		// []string, co... We only iterate further if it's a struct.
+		// i.e []foo or []*foo
+		if val.Type().Elem().Kind() != reflect.Struct &&
+			!(val.Type().Elem().Kind() == reflect.Ptr &&
+				val.Type().Elem().Elem().Kind() == reflect.Struct) {
+			finalVal = val.Interface()
+			break
+		}
+
+		slices := make([]interface{}, val.Len())
+		for x := 0; x < val.Len(); x++ {
+			slices[x] = s.nested(val.Index(x))
+		}
+		finalVal = slices
+	default:
+		finalVal = val.Interface()
+	}
+
+	return finalVal
+}