First version of Calypso Stats

The UI still need to be refined, but major features are all there. 
We want to start testing new Stats for real asap, and meanwhile refine stats UI with smaller PRs.
It's not safe to call `getResources()` here since the fragment isn't guaranteed to be attached to its activity yet ([see here](https://github.com/android/platform_frameworks_support/blob/master/v4/java/android/support/v4/app/Fragment.java#L618)). Instead, use `container.getContext().getResources()`