Adding mandatory cipher suites.  For #498.
Updating MTI to only apply to TLS 1.2
Removing header ordering requirements
Reflow
Removes reference set.
Merge pull request #562 from http2/cipher

Adding mandatory cipher suites
Merge pull request #568 from http2/header_order

Removing header ordering
Editorial improvements.

Updates section 3.1 on encoding and decoding contexts after reference
set removal.
Removes header emission.
Handles multiple SETTINGS_HEADER_TABLE_SIZE changes.

Closes #565 and closes #566.
Editorial work.
Typo correction.
Changed Header Set to Header List.

Following resolution of #568.
Editorial improvement.
Adds ordering requirements.
Temporary removal of reference.

Needed to allow make to work: reference only present in H2-14.
Hardening security requirements around TLS usage
Corrects titles.
Updates examples.
Exchanges static and header tables.