Updated the package.json to reflect (required) updates to grunt-karma (u...

"npm install" failed (from a clean checkout).  The reason it failed is that it was unable to resolve the grunt-karma branch.  My system is an iMac: 2.5 GHz Intel Core i5, 16GB of RAM running OS X 10.8.3.

I've provided a fix that address the following:
* The grunt-karma branch karma-v0.10 no longer exists (switched to default [master] branch)
* Karma has been updated to version 0.9.7