Use major.minor format in the version string of the sphinx configuration file
Fix typo in doctest
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
Raise a NotImplementedError when fitting composite models.
clarify error message
add changelog entry
use correct PR number
Fix typo in doc string

uncertaintys -> uncertainties
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 "known issue" for quantities sometimes losing their units
further changes based on feedback from @eteq
Changed non-existent "self.matrix" to "matrix"
Clarify that issue propagates to more complex functions in numpy and scipy