0.5.0-beta12

• Fixes a many toolbar handling errors
• Fixes formatBlock misbehaviours: in Safari selected content can be lost in some cases, acting on outer div if heading and paragraph elements are contained in div.
• Fixes behaviour when deleting with caret in beginning of LI outdents list. Shift+tab will to do this instead.
• Fixed deleting into block element wrapping contents wrong sometimes
• Fixed ctrl/meta + a not being able to select content in webkit if uneditable block element is first or last in editable area.