Improves examples. Closes 332.

Removes unnecessary removals from E.4.2, E.4.3, E.5.2, E.5.3.
Add pseudo-code for integer decoding. Closes 293.
fix GOAWAY mention again
Fixing busted (reformatted) example.
Defining padding for DATA.
Renumbering frame types.
Updating change log.
Adding security considerations for padding.
Adds possibility to update maximum table size.

Closes #341.
Change Huffman tables usage.

Same Huffman table for requests and responses.
Specific Huffman table for cookies.
Updating change log entry for GTFO.
Updating references.
Merge branch 'master' of https://github.com/http2/http2-spec
Improving clarity of GTFO text.
Merge branch 'master' of https://github.com/http2/http2-spec
Improving padding text.
fix broken XML (dangling reference)
Rename GTFO to GOAWAY
Merge pull request #366 from dcsommer/master

Restore GOAWAY
Reverting collateral edit from #366.