CONTENTBOX-75: Tweak to getWidgetCategories

Updated getWidgetCategories() to work without passing in the query
argument; updated widgets.cfc handler to remove arguments
CONTENTBOX-93: Enchance widget inserter

* Added ability to select public method of widget (and arguments) to
use for rendering of instance in editor
* Updated "docs" with drop-down to view hints and arguments of public
methods
* Updated global style.css with specific line-height for buttons to
help IE out a bit
* Removed old widget icons, added new ones (plus Illustrator file)
* Updated widget renderer to use specified rendering method for widget
(or default=renderit)
* Moved argument form out of helpers and into it's own view
Merge pull request #67 from existdissolve/development

Development