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
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
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
Added a section to the What's new for v0.2 about the I/O framework
removed the fft_type option from convolve as per issue #660.  User can
specify their own fft; there's no need for astropy to test it.
refactor != -> np.isnan, len(shape) -> ndim
cleaned up tests
removed residual scipy junk (had considered testing scipy... no need)