Update js/w3c/headers.js

re-change alt format class to rel=alternate (copy/paste error)
adding HTTP Live Streaming draft
adding ISO Base Media File Format reference
adding MPEG DASH reference
adding W3C Media Source Extensions draft
adding RTP RFC reference
Formatting HLS reference as JSON
Formatting RTP reference as JSON
Merge pull request #149 from cconcolato/cyril-new-refs

Hopefully additions not breaking anything this time
Merge pull request #148 from plinss/develop

Update js/w3c/headers.js
add RUBY-UC
v3.1.44
Merge branch 'release/v3.1.44' into develop