Additional debug data is allowed to be included in the GOAWAY frame:
https://http2.github.io/http2-spec/#GOAWAY. We now put that data into
frame.debug_data instead of returning a FRAME_SIZE_ERROR. Fixes molnarg#218
and molnarg#219.

Fixes molnarg#228

In the case where this._push(frame) returns null (i.e., the frame is too
large for the window and split or the window size is <=0), moreNeeded
will be set to null. Then this._queue.push(frame) is called, but
moreNeeded is still null. Thus, any time the window is <=0 or the frame
is split we'll hit the assert:

  var moreNeeded = null;
  if (this._queue.length === 0) {
    moreNeeded = this._push(frame);
  }

  if (moreNeeded === null) {
    this._queue.push(frame);
  }

  return moreNeeded;

Credit goes to @jrabek for original version of this patch

http://httpwg.org/http-extensions/origin-frame.html

ORIGIN FRAME uses codepoint 0xB, which BLOCKED was squatting
on. BLOCKED is removed by this patch.

Support for ORIGIN FRAME

Fixes molnarg#257

Use static module resolution

GOAWAY deserialization fix

Typo: finshed

memory leak fix (by argon) and another 'upstream is not defined' check

ignore inherited properties when iterating through flags

Remove invalid assert