Adding warning about prioritization
Whitespace cleanup
Adding note about use of frame
Adding a frame type.  (a=altsvc, b=blocked)
Merge pull request #516 from http2/altsvcframe

ALTSVC frame changes
Update HTTP2 and RFC7230 references
Update HTTP/1.1 references to use RFC numbers as anchors
remove dupl. sentence and clean up requirements terminology
move IDNA considerations into a separate section, applying both to header field and frame
chmod -x
Reclassify references, make IANA considerations consistent
add ref for host header field, reduce SNI references
remove unused files
Minor travis tweaks
Adding -lc suffix and last call note
Adding PUSH_PROMISE to DoS considerations as only excemption from state bounding
Making a final pass over the document for editorial consistency.
Reorganizing TLS section to add prohibition on renegotiation
Clarifying when renegotiation is OK