Stomp-py

* Remove the 'transform' method/functionality, as this never went into the official spec. Clients who still want this should
implement themselves, using a listener (see https://github.com/jasonrbriggs/stomp.py/blob/master/stomp/test/misc_test.py for
an example)
* Add support for STOMP 1.2 line endings
* Enforce "host" header on 1.2 connect requests (note: should be enforced on 1.1 connections, but it seems rabbitmq connections
fail if host is set)

* Separate protocol from transport mechanism, to improve the ability to support multiple protocol versions. Note: constructor
args are changing accordingly.
* Add initial support for STOMP 1.2
* Moved username and passcode params out of constructor and into the connect method. The basic connection process is therefore now:

> conn = stomp.Connection([('localhost', 61613)])
> conn.start()
> conn.connect('admin', 'password', wait=True)

* Integrate fix for threading primitives issue (http://code.google.com/p/stomppy/issues/detail?id=53)
* Add vhost constructor arg
* Change cli to __main__ (so you can run `python stomp` rather than `python stomp/cli.py`)
* Integrate interrupt patch (http://code.google.com/p/stomppy/issues/detail?id=48)
* Change test hosts and ports so that they're provided from the setup.py file

* Fix for gcd division error (http://code.google.com/p/stomppy/issues/detail?id=44)
* Fix bytes incompatibility issue in Python 3.3 (http://code.google.com/p/stomppy/issues/detail?id=51)

* Add receipt header to disconnect frame if not already present on a 1.1 connection

* Fix signature on override_threading method
* Fix for duplicate header handling
* Minor fix for Version var