Update grunt-jscs to 2.5.0

Update grunt-jscs to 2.5.0

2.5.0

Bump JSCS version to  2.7.0

2.4.0

Bump JSCS version to  2.6.0

2.3.0

Bump JSCS version to  2.5.0

2.2.0

* Update  jscs  dependency to  2.4.0
* Use new  Checker#execute  method, which allows to respect  maxErrors
* option when  fix  option is enabled
* fix  option is now directly passed to  Checker  class of  jscs
* Use new "idiomatic" preset instead of "jquery"
* Test in latest version of node in travis CI
* Update dev dependencies

https://github.com/jscs-dev/grunt-jscs/releases

Change-Id: I472a3c63fff814357799a3889b09bbb6a977474b