added test_imports to make sure all packages successfully import
added open_api_page function
Initial version of the astropy.constants docs
Add equivalency for f_nu <-> nu * f_nu
Add equivalency for f_lambda <-> lambda * f_lambda
Add an option to use names over IDs when converting a VOTable to a Table.
Add use_names_over_ids support to votable's connect.py
include all cosmology functions as methods of the cosmology object
remove now-incorrect sentence from cosmology docs
Fixes #622.  Add methods to look up elements by utype.
Update the *_by_utype methods to support returning multiple values
Fix for Python 2.6
add explicit tests of new methods
Add a known issues page
Added fix for configuration file causing exception when importing astropy from source.
Fixed astropy/__init__.py to better clean the namespace
Added modules that would lead to setuptools being imported to the unsafe import list in configuration file generation, since if setuptools is not installed, it is *not* downloaded automatically at runtime (and this causes issues if importing astropy for the first time and generating the configuration file).
Added LICENSE line to files that were missing it
Changed error when default configuration file is missing to raise ConfigurationDefaultMissingError instead of a generic ValueError
Updated default config file installation to issue a particular warning class if the default is missing on astropy import