update ag-data to 0.7.0 with caching support
install localforage to use as cache storage
inject localforage as the default cache adapter and expose it through the supersonic.data.storage.adapter namespace for optional configuration by the user
have test app use cache for showing the data
move note on window.ag.data closer to point of relevance
document extension to signature
Merge pull request #51 from AppGyver/feature/data-caching

Feature/data caching