Fixes vertical centering of 'badge' notification types.

The linear layout that applies the centering gravity needed to be a child of a root layout element.
Drawer is now full height
Changed fade out/in of contained activities to no longer affect the toolbar
Removed drawer toggle animation
Added background image to drawer header (current image is a placeholder), static blog name now appears if only one blog is visible
Settings in drawer now has a light grey background, increased bottom margin of single-blog textView in drawer
Changed drawer selection color to differentiate it from settings background color, restored drawer listener to fix bug where back arrow still appears in toolbar after drawer closes.
Added Joen's header image with different sizing for tablets
Merge pull request #2042 from wordpress-mobile/feature/full-height-drawer

feature/full-height-drawer
Merge pull request #2041 from wordpress-mobile/issue/2037-notifications-centered-badge

Fixes vertical centering of 'badge' notification types.
3.5-rc-1 - versionCode 154
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into issue/2043-reader-comment-recycler