adding wpmu-theme-usage-info by DeannaS
Initial import.
Fixed typos in readme.txt
updating contributors
Includes show/hide script for admin page and testing up to 2.9.1.1
Updating to indicate tested to 3.0.
Updating to 1.2 version for use with WP 3.1
Updating readme with 1.2 info.
Adding the 3.3 version
updated to 1.7: tested ompatible through 3.4.2
Updates for Version 1.8: Check, and inform user if necessary, about a site trying to use a theme that no longer exists