added test_imports to make sure all packages successfully import
include all cosmology functions as methods of the cosmology object
remove now-incorrect sentence from cosmology docs
Update astropy.time setup to allow using system sofa_c library
Related to #618, this adds a What's New section for units and quantities.
As per #618, adds a "What's New in 0.2" section for `io.votable`.
As per #618, adds a "What's New in 0.2" section for `wcs`
Correct typo
add explicit tests of new methods
Add a known issues page
Merge pull request #636 from mdboom/vo/whatsnew0.2

io.votable: what's new in 0.2
Merge remote-tracking branch 'mdboom/unit/whatsnew'

Conflicts:
	docs/whatsnew/0.2.rst
Merge remote-tracking branch 'mdboom/wcs/whatsnew0.2'

Conflicts:
	docs/whatsnew/0.2.rst
Added fix for configuration file causing exception when importing astropy from source.
Fixed astropy/__init__.py to better clean the namespace
Fix Row len() so it works for masked array
Add test of adding a Row object to a Table
Add What's New for io.ascii
Merge pull request #654 from taldcroft/table-add-masked-row

Fix Row len() so it works for masked array
Added LICENSE line to files that were missing it