Added grunt build scripts. Related to: https://github.com/EFForg/privacybadgerchrome/issues/305
Style update: shortened long line and removed commented out code.
Merge pull request #306 from SomMeri/grunt-build-305

Grunt build script
Merge pull request #309 from EFForg/cookieblock

add kinja to cookieblock list and ignore node_modules
add dropboxusercontent to cookieblock list