Switched to file based XSLT

Pull the XSLT from a file instead of the admin UI.  Also added a table
based xslt script.
Datatable & Setting Tweaks

Removed the XSL settings fields from the UI.  Tweaked how the data
table is displayed
Removed refactored code

Removed functions related to the old way of storing XSLT within options.
Group Filtering

Changed to only show public and active groups.  Also fixed HTML escaping
Add Events Listing

Added back in the public calendar events listing
Remove temporary files
Merge branch '0.5'