Bump grunt-contrib-sass to v0.9.1.

Gruntfile.js

@@ -64,7 +64,6 @@ module.exports = function (grunt) {
 
     sass: {
       options: {
-        banner: '<%= banner %>',
         sourcemap: 'none',
         style: 'expanded',
         unixNewlines: true

package.json

@@ -34,7 +34,7 @@
     "grunt-contrib-csslint": "~0.4.0",
     "grunt-contrib-cssmin": "~0.11.0",
     "grunt-contrib-jshint": "~0.11.0",
-    "grunt-contrib-sass": "~0.8.1",
+    "grunt-contrib-sass": "~0.9.1",
     "grunt-contrib-uglify": "~0.7.0",
     "grunt-contrib-watch": "~0.6.1",
     "grunt-csscomb": "~3.0.0",