1.x-3.0.0-alpha2

Changes from 1.x-3.0.0-alpha:

• ea7e847 Only right align action buttons when in the page title area. by @laryn
• Issue #51: Fix dropbutton padding. by @laryn
• Issue #52: Make admin icons more flexible for other backgrounds. by @laryn
• Issue #54: Set up edit sidebar as a theme setting option. by @laryn