Fix argument handling in irsa.Irsa.query_region
Fix argument handling in irsa.Irsa.query_region

* The default spatial query type (spatial='cone') was incorrectly
  capitalized (should be spatial='Cone'), so that using the default
  always caused an empty result set.
* An 'else' clause now catches completely unrecognized spaital query
  types.
* Coordinates are now formatted in a way that is recognized by the Gator
  service.

imbasimba/astroquery,ceb8/astroquery,ceb8/astroquery,imbasimba/astroquery