Added deprecation warning to BitTorrentBroadcast and TreeBroadcast implementations. TorrentBroadcast is replacing them.
Add deprecation warning to unrecognized MASTER urls

Unrecognized MASTER urls will throw an exception rather than be parsed as Mesos URLs
in 0.9. See https://github.com/apache/incubator-spark/pull/71
Merge pull request #79 from aarondav/scdefaults0.8

Add deprecation warning to unrecognized MASTER urls

Unrecognized MASTER urls will throw an exception rather than be parsed as Mesos URLs
in 0.9. See 74737264c4a9b2.
Merge branch 'branch-0.8' of github.com:mosharaf/incubator-spark into branch-0.8

Added deprecation warning to BitTorrentBroadcast and TreeBroadcast

Users should gradually move toward TorrentBroadcast.