Follow the Android writing style:
https://developer.android.com/design/style/writing.html

* remove "Sorry" and "Please"
* remove unecessary "Try again later"
* use contractions ("don't" instead of "do not", etc.)
* capitalization
remove unused string
recapitalize url -> URL & fix apotrophes
s/>could/>Could/
Use a view pager to hold the different stats tabs. Makes it possible to swipe between fragments, and it is animated.
Revert "Use a view pager to hold the different stats tabs. Makes it possible to swipe between fragments, and it is animated."

This reverts commit 8fd4f23231792065b9e6208b998b3b41c5ece440.
Added a quick fade between fragment transactions in StatsAbsPagedViewFragment. Fixed janky replacement animation by setting the min height of the container to its current height.
Fixed up UX for StatsVisitorsAndViewsFragment:

 * Extracted out the bar char views into their own fragment. This allows the data below the chart to only be loaded once (instead of loaded in 3 separate fragments like it was previously)
 * Fixed wonky reload of bar chart data. Instead of removing all of the views, we just check for an existing bar graph and update its data if it exists.
Fixes margin between radio group and chart
Matching up tablet layout for stats visitors and views to use new container and radio buttons.
Merge branch 'develop' into issue/726-writing-style

Conflicts:
	res/values/strings.xml
s/Create a WordPress.com blog/Create WordPress.com blog/
use emailchecker 0.2 to fix #778
fix #789: check for current blog
fix #730: uppercase file extension weren't recognized
Merge pull request #787 from wordpress-mobile/issue/778-unsatisfiedlinkerror

Use emailchecker 0.2 to fix #778
Merge pull request #790 from wordpress-mobile/issue/730-cant-upload-certain-files

fix #730: uppercase file extension weren't recognized
Show 'Up' button on those activities that were not showing it.
Merge pull request #791 from wordpress-mobile/issue/789-npe-shareintentreceiver

fix #789: check for current blog when saving pref in shareintentreceiver
Fix #796