Use the system monospace font in the docs
Allow for custom datatype names in votable

This should allow end users to workaround VOTable files that contain
invalid datatypes.

Also adds two datatypes seen in Vizier tables: "unsignedInt" and "unsignedShort".
Update docs about datatype mappings.
Add changes entry.
Implementation of wcs_to_celestial_frame
Minor improvements
Make wcs_to_celestial_frame extensible
Added tests and docstring for ``wcs_to_celestial_frame``
Skip doctest
Added changelog entry
Fix the test for an unedited astropy 0.3.2 config

Ignore the jquery_url line when calculating md5sum.
Modernize jsviewer configuration items.
Use astropy_helpers for setup_helpers
Don't use setup_helpers at all
Restore io.fits and io.votable options
Fix error message about moved configuration items.
Add CHANGES entry.
Mention all_world2pix
Merge pull request #2775 from mdboom/wcs/use-astropy-helpers

Use astropy_helpers for setup_helpers in wcs test_api_extension
Merge pull request #2777 from mdboom/wcs/mention-all_world2pix

missing mention of all_world2pix method