Preset: Grunt

Fixes #742

Depends on: https://github.com/jscs-dev/node-jscs/pull/749
@markelog in grunt-usemin there are some exceptions above 120 characters. Mainly about logging often in concatenating string. See below:

in grunt-usemin : 
* 1 line is > 150 chars (184) about concatenating an error message
* 2 lines are > 120 chars, same as above plus a commented line

in grunt-filerev:
* no line is more than 120 chars

I've tested in 5-6 grunt-contrib-* plugins like `grunt-contrib-handlebars`, `grunt-contrib-copy`, `grunt-contrib-uglify`, and there was nearly no errors about a line being more than 120 characters. And it was only about concatenating strings for log output.