WIP 2.2.0 release

TODO:
* push moment develop, master, tags
* momentjs.com pull moment submodule
* verify all added stuff (links and documentation, tests)
* tweet, release on npm
Updated docs for 2.2.1 release
Stupid git crlf on images wtf
Merge branch 'pre-2.2.0-release' into gh-pages
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages