* Update channel_session decorator to rehydrate http_session
Update the http_session decorator to write the http session key
to the channel_session when available. This allows the channel_session
decorator to rehydrate the http_session after the initial websocket
connection.
closes#318
* Add persist=True option to http_session
* Add explicit option to store the session key in the channel session
* Update docs
* Add test case
* Add channel_and_http_session decorator
This decorator enables both sessions and maintains
the http_session for the lifetime of the websocket connection.
* improved @enforce_ordering to leverage a wait channel to avoid spinlocks
* addressed pyflake issues
* renamed wait channel to __wait__.<reply channel>
* handled potential ChannelFull exception
* updated sessions unit tests
* updated enforce_ordering tests to reflect new approach of leveraging wait channels
* addressed pyflake issues
* more pyflake fixes
* removed close_on_error handling on enforce_ordering since only worked on websockets
