Wrap spec its in a describe.
Add a test that published drafts have #path changed.
Clean up the newly created file.
Add a Draft#autopublish? method.
Add the notion of an autopublish header to Draft.
Support a 'publish: now' for drafts.

See #9.
Merge pull request #9 from aprescott/preprocess-draft-publications

Pre-process drafts to publish based on metadata headers