Adds localForage caching behavior (bug 1001779).

Adds localForage caching behavior (bug 1001779):

* Include localForage in package.
* Use localStorage driver when running in damper, IndexedDB driver when packaged.
* Add module for getting/setting apps, categories, and homepage data in localForage.
* Preload data included with package, if necessary.
* Removing blocking on consumer_info calls.