New date parsing implementation

- Added support for MS JSON Date format
- Added cross-browser ISO date parsing based on
https://github.com/gaperton/js-iso8601
Merge remote-tracking branch 'origin/master'

Conflicts:
	nestedtypes.js
Merge branch 'master' of https://github.com/Volicon/backbone.nestedTypes

Conflicts:
	nestedtypes.js