Updated version for v1.3.0 snapshot.
- [hazelcastmq-core] Reworked the threading/locking in the context and core
to make it simpler and more consistent with the JMS 2 specification.
Added some notes on transactions, ack, and threading.
Fix Issue #5: Updated the README to contain the correct dependency group ID in the example.
[hazelcastmq-core] Exposed a XAHazelcastMQContext to allow access to an XAResource 
for participation in global, two-phase commit transactions. (alpha)
Updated the yeti documentation and fixed a couple of broken links.
Implemented a wrapper on the Hazelcast XAResource to properly recreate the transaction context
after a transaction ends in order to support multiple transactions in the same HazelcastMQContext.
Wrote an example/test case that uses Atomikos to verify XA behavior in HazelcastMQ.
Releasing v1.3.0 with better Spring and XA transaction support.