If running in an msys shell, use the /home/embray environment variable set in that shell to find the user's home.  The surest way to determine this is if the MSYSTEM environment variable is set (it doesn't matter what it's set to).  Obviously this isn't foolproof but there are few better alternatives (one might be to try calling 'uname').
Add function to calculate inverse of cosmology function and tests
Add changelog entry
updates based on feedback
minor doc updates
add description of z_at_value along with some other minor clean-ups
Fix test failures introduced by doc changes
more changes to address travis build failures
Add support for OGIP format units.
Add warning that `Wcsprm` should not be used to get the original values
of keywords in the header.
Call `set` from within the WCS constructor.
Add "known issue" for quantities sometimes losing their units
further changes based on feedback from @eteq
Add convenience class for comma-separated-values files

Read and write comma-separated-values files with
ascii.read(‘file.csv’,format=‘csv’)
ascii.write(table,”output.csv”,format=‘csv’)
Does not yet automatically recognize .csv extension
Add tests for CSV in io.ascii
Add CSV test file
Add CSV option to documentation tables
Changed non-existent "self.matrix" to "matrix"
Clarify that issue propagates to more complex functions in numpy and scipy
Fixed bugs in sphinx docs