Removed unused drawables from density-independent folder, those that were used were moved to drawable-mdpi
Removed unused stats disabled buttons, replaced mdpi ic_share.png with correct density
1st pass at removing unused drawables
2nd pass at removing unused drawables
3rd pass at removing unused drawables
Returned missing mdpi menu_button_bg.9.png
Merge pull request #906 from wordpress-mobile/issue/883-cleanup-drawables

Issue/883 cleanup drawables