Change clunky locking used in library APIs to use reference counting
instead. A BIG thanks to Chris Friesen who provided the initial ideas,
additional comments and more ideas leading up to the commit.

BKrev: 40eafcb50VMDbK4i9ZEiu0_90gFlPQ


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@55 fd59a12c-fef9-0310-b244-a6a79926bd2f