Removed build detritus.

Abandoned Ant in favor of building with Maven.  Removed all files that
were part of and/or required by the Ant build process.
Changed parent back to Sonatype.

Not building this bundle as part of the core Protege multi module Maven
build.  This bundle will be published separately as needed, and pulled
in as a Maven dependency.
Updated scm element.

Code was moved to GitHub from Stanford hosted Subversion repository.
Upgraded dependencies.
Added mailingLists element with contact info.
Added link to issue tracker.