Cache directory not deleted when repository removed from Fisheye

When an administrator deletes a repository in Fisheye, the [fisheyedata]/var/cache/[repoisitory] directory is not removed.
This leaves a large amount of data on the disk.

• Add option to delete cache on repository removal

Short term resolution is to do a directory scan of [fisheyedata]/var/cache/ and compare against repositories found in the config.xml file. Remove directories if missing.