MAHOUT-1275 Dropped bz2 distribution format for source and binaries

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1500898 13f79535-47bb-0310-9956-ffa450edef68
Temporarily reverted MAHOUT-1275 changes, scheduled for 0.9, while 0.8 code freeze is on

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1501110 13f79535-47bb-0310-9956-ffa450edef68