Scott Mitchell 0e9545e94d Http2RemoteFlowController stream writibility listener
Motivation:
For implementations that want to manage flow control down to the stream level it is useful to be notified when stream writability changes.

Modifications:
- Add writabilityChanged to Http2RemoteFlowController.Listener
- Add isWritable to Http2RemoteFlowController

Result:
The Http2RemoteFlowController provides notification when writability of a stream changes.
2015-09-28 13:47:24 -07:00
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