Added job retries, merging of task sets, flagging and retrying dead connections, and various cleanups and optimizations.
Added job retries, merging of task sets, flagging and retrying dead connections, and various cleanups and optimizations.

git-svn-id: 4c08e0f901c924964e8626473d70c86c180067a2@305 011c6a6d-750f-0410-a5f6-93fdcd050bc4

saymedia/python-danga-gearman,saymedia/python-danga-gearman,samuel/python-gearman