JSCS config clean-up

Removed redundanct settings that already are in jQuery preset from node-jscs.

Ref: https://github.com/mdevils/node-jscs/blob/master/presets/jquery.json

Also removed `excludeFiles` in config for 2 reasons: 
- files should be declared in a single configuration file, Gruntfile.js, even for ignored files
- It's unnecessary to declare those ignored files, they aren't related to the checked files. (Gruntfile and src and test folders).