Correct example to reference the updated table
Merge pull request #487 from n1hility/master

Correct example to reference the updated table
Re-adding issues.json; the point of this is to keep a backup of the issues list, in case something happens to/with Github.
Updating issues
Adding extensions back
Clarifies duplicate allowance in "sets".
Improve explanations about memory limitations
Clarifies differences between literal representations.
Misc editorial improvements
Removing EXTENSION frame
Updating based on interim discussion
Changing IANA policy for frame types
Merge pull request #493 from http2/extend

Adding extensions back.  Closes #95.
make the XML valid
Removing requirements on Content-Encoding
Merge pull request #495 from http2/nocontentencoding

Removing requirements on Content-Encoding.  Closes #460
Fixing missing xref
Updating issues; checkpoint
Adding ability to send PRIORITY on closed stream, as new priority scheme demands.