fix(build): bad concatenation of main.css

Close #193

Author: hsablonniere

templates/common/Gruntfile.js

@@ -287,10 +287,10 @@ module.exports = function (grunt) {
     'coffee',
     'compass:dist',
     'useminPrepare',
+    'concat',
     'imagemin',
     'cssmin',
     'htmlmin',
-    'concat',
     'copy',
     'cdnify',
     'ngmin',