README changes and version update

Updated Angular 2 to release

Added gravatar directive and updated pages to use it

Updated Angular to version 2.0.0-rc.6 and fixed breaking changes. The…

… biggest change was updating the `systemjs.config.js`

Updated to v0.5.0. Lots of changes to config

Fixed ngZone bug

Readme fixes. v0.4.2

Update README.md

Update to v0.4.0

v0.3 changes