[weld-dev] tx services

IMO TransactionServices should also expose TransactionManager. Since with AS7, which hides TM from JNDI, one cannot easily register XAResources: Transaction public boolean enlistResource(XAResource xaRes) throws RollbackException, IllegalStateException, SystemException or suspending/resuming current Tx. Specially XAResources handling is a must to be able to enlist if you're doing some non-trivial tx-based work. This way the integration layer would make sure the TM is exposed as a CDI service. Wdyt? -Ales