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.

Keeping track of opening issues here:
- [x] There's no selection highlight on any of the tappable views, which is even more important on Lollipop where ripples are used. The simplest way to provide this is to use android:background="?android:selectableItemBackground" on any tappable view (this will automatically provide the ripple on Lollipop and a selection highlight on earlier version).

- [x] Try to get rid  of the setEntryTextViewClickListener() hack. See comment below

- [x] Make sure the correct date/datetime for the blog. Seems there is a offset of 1hr.

- [x] I recommend selecting the "Stats" folder in Android Studio then selecting Analyze > Inspect Code > Current Directory

- [x] The selection highlight for list items seems off. It should highlight the entire row - including padding - but instead it highlights just the text.
![selection](https://cloud.githubusercontent.com/assets/3903757/5516035/026cab7c-8855-11e4-9ee5-e0fc1d2129d9.png)