Make noVNC follow the RFB protocol and keep only one outstanding
framebufferUpdate request at a time.
Merge branch 'master' of https://github.com/kanaka/noVNC into framebufferupdate
* Removed fbu-requests from the places I missed earlier.
* Added a few clarifying comments.
Merge pull request #282 from samhed/framebufferupdate

Allow higher frame rates by using a new approach for framebufferUpdate requests