PROTON-284: Added first version of ConnectionTest and TransportTest which contain AMQP spec-driven JUnit tests.
We think the set of test methods is nearly complete. However, only a few have been implemented. Only these ones
have the @Test annotation.
Enhanced Proton Factory classes to allow the proton-c or proton-j implementation to be requested.
Also added JavaDoc in various places to highlight issues that the tests have revealed.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1464428 13f79535-47bb-0310-9956-ffa450edef68