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.
Restore io.fits and io.votable options
Fix error message about moved configuration items.
Add CHANGES entry.
Add baryonic matter density paramter and its evolution to cosmology classes
add dark matter only density parameter and its evolution
update doctests for Omega_b
Add baryonic matter density paramter and its evolution to cosmology classes
add dark matter only density parameter and its evolution