Implement "preset" option

* Add "setPreset" method to "string-checker" module, so you can use "preset"
option in browser, right now, only "jquery" preset is supported

* Add new "preset" option to cli module. Without testing right now, since this
module is pretty hard to test

Fix #54
Check out jscs version
Rename variable and add getter for config property
Merge pull request #95 from markelog/presets

Implement "preset" option