* using Enum for wamp protocol message Code
* using IntEnum to allow for int comparisons like Code.HELLO == 1
* reverted tests to expected [<int>...] instead of [<Code>...]
Pep8 :)
Merge pull request #6 from ef-ctx/wamp-code-enum

Wamp code enum
Manual merge (related to message codes being represented as Enum)
Add ClientConnection.get_subscription_id