Added SCSS preprocessor the yeoman generator
diff --git a/views/ngXosLib/generator-xos/app/templates/gulp/server.js b/views/ngXosLib/generator-xos/app/templates/gulp/server.js
index 7605294..1c8a0a7 100644
--- a/views/ngXosLib/generator-xos/app/templates/gulp/server.js
+++ b/views/ngXosLib/generator-xos/app/templates/gulp/server.js
@@ -9,6 +9,7 @@
 var wiredep = require('wiredep').stream;
 var httpProxy = require('http-proxy');
 var del = require('del');
+var sass = require('gulp-sass');
 
 const environment = process.env.NODE_ENV;
 
@@ -78,6 +79,19 @@
     gulp.watch(options.src + '**/*.html', function(){
       browserSync.reload();
     });
+    gulp.watch(options.css + '**/*.css', function(){
+      browserSync.reload();
+    });
+    gulp.watch(`${options.sass}/**/*.scss`, ['sass'], function(){
+      browserSync.reload();
+    });
+  });
+
+  // compile sass
+  gulp.task('sass', function () {
+    return gulp.src(`${options.sass}/**/*.scss`)
+      .pipe(sass().on('error', sass.logError))
+      .pipe(gulp.dest(options.css));
   });
 
   // transpile js with sourceMaps
@@ -137,6 +151,7 @@
 
   gulp.task('serve', function() {
     runSequence(
+      'sass',
       'bower',
       'injectScript',
       'injectCss',