Removed jslint submodule.
Removed support of jslint.

* Raise exception, if jslint.rb is still present.
Updated jshint to version 1.0.0.

Downloaded "Browser Bundle" from http://jshint.com/install/
Adjusted jshint options.

No more:
* regexp
* nomen
* devel
* plusplus
Added ruby 2.0.0 to travis test matrix.