Today, I just updated the library to a new version, v0.2, which includes the following two updates:
- Cross-browser support
- Bug fixes for synchronous calls that don't have any return values
So the library should work for CRM 2011 December 2012 Service Update or UR12.
The new version is available for download at codeplex website. Please let me know if you run into any issues with the new version.
Hope this helps.