v0.47.2 released

This point release fixes a librbd bug and a small items:

• librbd: possible livelock with the caching enabled
• libs3 compilation/install confusion (when building from source)
• ceph.spec updates

You can get it from the usual places:

• Git at git://github.com/ceph/ceph.git
• Tarball at http://ceph.newdream.net/download/ceph-0.47.2.tar.gz
• For Debian/Ubuntu packages, see http://ceph.newdream.net/docs/master/install/debian