Upgrading to HTTP/2 draft 14 HTTP/1.x message flow

Motivation:

HTTP/2 draft 14 came out a couple of weeks ago and we need to keep up
with the spec.

Modifications:

-Allow informational type messages to be sent up the pipeline immediatley.
-Corrections to HttpObject comparitors to support test cases
-New test cases to support sending headers immediatley
-Bug fixes cleaned up to ensure the message flow is terminated properly

Result:
Netty HTTP/2 to HTTP/1.x translation layer will support the HTTP/2 draft message flow.
The naming may be confusing but the `processHeadersBegin` and `processHeadersEnd` abstract out common functionality that is done when ever an Http2Headers object is received in a onXXRead callback.  This functionality is currently used in the 2 onHeadersRead methods and the onPushPromise method.  These methods are just to reduce duplication of code.

Does this make sense?  Would an alternative naming convention be more clear?