Enhancement for Select Editor 

Included a reference to the form object so that at render the select callback can leverage data on the form to customize data returned by callback.

Sample use case below.

![Screen Shot 2013-01-11 at 10 55 56 AM](https://f.cloud.github.com/assets/840704/60769/c96dd57e-5c20-11e2-8c04-300aac772dd7.png)