Couple updates

Tests, comments and minor improvements. Only one noticeable thing, i suppose, is a change in the README for `config` option, in order to remove confusion like <a href="https://github.com/gustavohenke/grunt-jscs-checker/pull/48#issuecomment-46666234">this</a>. 
Rebased. 

Funny, a lot of things lead to that issue, like: didn't do proper `npm i`, didn't correctly set settings in new editor, should have checked travis run a bit after i send a PR and of course - shouldn't had high hopes for Russia vs Belgium match :((