add frontend_only option
diff --git a/xos/core/models/xosmodel.py b/xos/core/models/xosmodel.py
index 4942241..01c9514 100644
--- a/xos/core/models/xosmodel.py
+++ b/xos/core/models/xosmodel.py
@@ -14,6 +14,7 @@
     db_container_name = StrippedCharField(max_length=200, help_text="name of XOS db container", default="xos_db")
     docker_project_name = StrippedCharField(max_length=200, help_text="docker project name")
     enable_build = models.BooleanField(help_text="True if Onboarding Synchronizer should build XOS as necessary", default=True)
+    frontend_only = models.BooleanField(help_text="If True, XOS will not start synchronizer containers", default=False)
 
     def __unicode__(self):  return u'%s' % (self.name)