Tightening frame size restrictions
Allowing validation of padding bytes
change "of a length" to "with.."
Merge pull request #619 from phluid61/frame_size

change "of a length" to "with.."
Reworking the dynamic table size section
Dynamic table maximum depends less on HTTP/2
Moving header table size text around
Rewriting header encapsulation attacks section
Switching to a blanket malformedness requirement
Changing 1xx example to explicitly use 100-continue.  Closes #614.
Merge pull request #617 from http2/zero_pad

Allowing validation of padding bytes
Merge pull request #605 from http2/headerenc

Rewriting header encapsulation attacks section
Merge pull request #616 from http2/frame_size

Tightening frame size restrictions
Merge remote-tracking branch 'origin/table_size'
Tweaks maximum table.
s/downstream//
Loosen frame size error on PRIORITY
Exhaustive FRAME_SIZE_ERROR conditions.
Clarifying that connection is closed after GOAWAY on errors.
Nits cleanup