Fixed plugin to work with RA >= 0.3

Hi, 
I fixed the plugin to work with RA >= 0.3.

Due to RA's dependency on jQuery 1.9.1, which removed $.browser API, I also updated the JCrop assets to JCrop 0.9.12.

Without thinking about it I already bumped the version to 0.2.2, sorry about this, hope you don't mind.

Finally, thanks a lot for this plugin, it is really powerful and simple to configure.