Update version and copyright
Add AMScd documentation
Fix code mode for \require command
Update google group links to modern versions
Add documentation for localization.
Add information about localization strings for messages and HTML snippets
Add localization-string file left out of previous commit
Fix problem with code reference
Fix typos, add summary of HTML snippets, and add placeholder for localization API (still to be written).
Added what's new in v2.2
Add links to issue tracker items in what's new.
Fixed typo
Added documentation for content-mathml extension.
Add Safe-mode documentation
Fix some wordings and markup
Add localization API information
Change markup to use :meth: for method calls
Remove links to user help on www.mathjax.org
Fix ..method (missing space)
Fix up some formatting issues and some links