Toggle state of "blog this" button to "unpost" for posted posts.

Fix #15
Redirect to referrer on unpost.

Whenever possible. Fall back on the bloggers blog listing page.
Expand to preview post bodies in dashboard

Fix #8

There is probably a memory leak in the event binding code in main.js. It's not a big deal here because there are always few posts, but it probably should be refactored.