rm hipchat and redis-namespace (already in Fedora)

The following gems are in Fedora:

 * Hipchat: https://bugzilla.redhat.com/1015326
 * Redis-namespace: https://bugzilla.redhat.com/1025984
Merge pull request #9 from ktdreyer/rm-hipchat-redis-namespace

rm hipchat and redis-namespace (already in Fedora)