Track Mixpanel analytics event "stats scrolling to bottom"
Rewrote the AppLog viewer to use a ListView+adapter
Added UserPrefs methods to get/set/reset the last activity string, now read at startup when restoring the previously selected activity
Replaced all usage of commit() with apply() in UserPrefs, as per http://developer.android.com/reference/android/content/SharedPreferences.Editor.html#apply%28%29
Added PREFKEY_LAST_ACTIVITY_STR to UserPrefs.reset()
Cherry picked Issue/1706 illegalstateexception readerpostlist round2
Resolved incorrect path for ReaderTaskFragment
Merge pull request #1741 from wordpress-mobile/issue/1729-restore-last-activity

Issue/1729 restore last activity
Merge branch 'release/3.1' into issue/1732-janky-applog-viewer
Merge branch '1714-stats-scrolling-to-bottom' of https://github.com/wordpress-mobile/WordPress-Android into release/3.1
Merge branch 'release/3.1' into issue/1732-janky-applog-viewer
Merge branch 'release/3.1' into issue/1743-helpshift-direct-integration

Conflicts:
	WordPress/src/main/java/org/wordpress/android/WordPress.java