fix #1362: use default public constructor for ThemeTabFragment and ThemeSearchFragment
Make sure the activity is NOT destroyed when trying to show the notification details screen.
Merge pull request #1363 from wordpress-mobile/issue/1362-themetabfragment-constructor

fix #1362 themetabfragment constructor
Make sure isDestroyed is called on API 17+, and make sure super.onCreate is not called with null parameter in CommentsActivity and NotificationsActivity.
Move isDestroyed() to a separate routine
Merge pull request #1372 from wordpress-mobile/issue/1370-crash-when-opening-notification

Fixing IllegalStateException when opening Notification details from PN
First pass at sticky header in blog preview (incomplete)
Moved most of the logic for scaling mshot and positioning sticky header out of ReaderListFragment and into ReaderBlogInfoHeader
Further cleanup of sticky header in blog preview, removed ReaderFullScreenUtils
Merge branch 'master' into develop
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into feature/reader-discovery
Fixed bug that caused mshot to bleed over listView when showing blog preview