Astroquery is put in the useragent headers now
refactor: MockResponse is now a common class for all tests
AND useragent posting works locally
refactor: all remote tests now reload requests to undo any
monkeypatching.  Ugly, but easiest way to get things done.
Remote tests all pass! (Except MAGPIS, service is presently down)
Merge pull request #209 from keflavich/useragent

Requests should include astroquery as the posting agent