chore(grunt): use grunt-sass instead of grunt-contrib-sass

closes #1673

Author: Awk34

Diff for: app/templates/_package.json

@@ -131,7 +131,7 @@
     "grunt-injector": "^0.6.0",
     "grunt-karma": "~0.12.0",
     "grunt-build-control": "^0.7.0",<% if(filters.sass) { %>
-    "grunt-contrib-sass": "^1.0.0",<% } %><% if(filters.stylus) { %>
+    "grunt-sass": "^1.1.0",<% } %><% if(filters.stylus) { %>
     "grunt-contrib-stylus": "^1.2.0",<% } %>
     "jit-grunt": "~0.10.0",
     "grunt-express-server": "^0.5.1",