Improving speed of Travis builds by not requiring sudo

.travis.yml

@@ -1,11 +1,8 @@
+sudo: false
 language: node_js
 node_js:
 - 6
 
-before_install:
-- npm install -g grunt-cli
-- gem install sass
-
 after_success:
 - npm run codecov
 

package.json

@@ -31,13 +31,14 @@
   "devDependencies": {
     "codecov.io": "^0.1.6",
     "grunt": "^0.4.5",
+    "grunt-cli": "^1.2.0",
     "grunt-contrib-concat": "~0.5.0",
     "grunt-contrib-cssmin": "^0.10.0",
     "grunt-contrib-jshint": "^1.0.0",
     "grunt-contrib-uglify": "~0.4.0",
     "grunt-contrib-watch": "^0.6.1",
     "grunt-karma": "^0.12.1",
-    "grunt-sass": "^1.0.0",
+    "grunt-sass": "^2.0.0",
     "jasmine-core": "^2.3.4",
     "jshint-stylish": "^2.1.0",
     "karma": "^0.13.10",