Adding pubmed support.

Adding support sketch.

It's doing a thing.

Actually have something reasonable.

Making it more like others.

Better authors field.

Adding month and year.

Handling case when Month isn't given.

Adding a response for XML.

Fixed xml FakeWeb route, and cleaned up pubmed speccing code a touch

Refactoring pubmed_onebox
Merge pull request #199 from matsen/pubmed-pr

Adding PubMed support.
Making www mandatory for pubmed.