Include the Class Applier module for Rangy in rangy-core.

This module is very usefull when developing plugins that needs to apply CSS classnames to selections. For more information see: https://getsatisfaction.com/aloha_editor/topics/toggling_av_css_classes

Note that this will enable us to contribute with some awesome plugins that we made like:

* A colorpicker for setting fore/background color

![screen shot 2013-08-13 at 10 37 31](https://f.cloud.github.com/assets/353888/953393/e4f82746-03f4-11e3-9129-6b19b421d51c.png)

* CSS Class select

![screen shot 2012-12-04 at 10 13 31](https://f.cloud.github.com/assets/353888/953396/f679ba52-03f4-11e3-8602-0b1a09ea3e37.png)

* Font select

![screen shot 2012-11-29 at 10 22 18](https://f.cloud.github.com/assets/353888/953397/03f08b66-03f5-11e3-99b5-c5a2320b429e.png)