Updated scm info from SVN to GitHub.
Added issuer tracker information.
Removed maven-eclipse-plugin.
Added repositories element.

The explanation library that this bundle depends on is now available
from the Protege Project's GitHub Maven repository.
Removed Ant build detritus.

Building with Maven now.  Removed anything that was used for the old Ant
build process.
Removed outdated plugin update files.

The readme was empty and the update.properties file had links to the DL
Query Tab.  These would be better created anew and hosted in the Protege
Project's autoupdate repository.