admin.widgets.js

Rewrote admin.widgets.js to allow external styling. Added drop functionality to available widgets to accept installed widgets drop to delete.

Added two classes to admin.css to style hover colors of available widgets, installed widgets and trashcan.

I think I fixed the bodged push I did yesterday, you shouldn't see any changes other than those three files on master.  I am branching master off to do the HTML5 work because I will be doing heavy modifications of the output.