Added ascii art for the WINDOW_UPDATE frame.
Client settings during Upgrade-based negotiation

#51:Client advertising settings during Upgrade dance
https://github.com/http2/http2-spec/issues/51
address some comments on this pull

IANA section. Short blurb on why this header exists, and clarifying that
an empty header is fine.
make links more obvious
move information about the draft format down
remove redundant para
Add section reference to SETTINGS_INITIAL_WINDOW_SIZE.
Indicated the SETTINGS that must be communicated
Merge pull request #148 from jpinner/flow_control

Add section reference to SETTINGS_INITIAL_WINDOW_SIZE.
Crediting editorial contributions.
Merge branch 'master' of github.com:http2/http2-spec
Merge pull request #143 from jpinner/ascii_art

Added ascii art for the WINDOW_UPDATE frame.
Addressing frame size limitations.  Closes #6.
Merge branch 'master' of github.com:http2/http2-spec
Fixing a minor inconsistency.
Clarifying what is reserved in WINDOW_UPDATE.
Marking this as a hop-by-hop header.
Merge pull request #146 from GabrielMontenegro/master

client settings during Upgrade-based negotiation
Merge branch 'master' of github.com:http2/http2-spec
fix references