Support for drafts

[derekgottlieb]

I haven't had a chance to look over the code and how drafts are handled in octopress 3, but it'd be great if octodmin included support for draft posts. Functionality I can think of:

• create posts in draft status
  • by default?
  • configurable setting to control whether you create drafts or posts by default?
  • separate buttons to create new post vs draft?
• support for editing drafts
• transition draft to post