It fix "npm install" fails on node ^0.12.
@ -30,7 +30,7 @@
"grunt-contrib-jshint": "~0.10.0",
"grunt-contrib-uglify": "~0.4.0",
"grunt-contrib-watch": "^0.6.1",
"grunt-sass": "^0.17.0",
"grunt-sass": "^1.0.0",
"load-grunt-tasks": "~0.2.0"
}