minor typo in coordinates docs
Merge pull request #1951 from mdboom/wcs/upgrade-4.20

Upgrade wcslib to 4.20
Merge pull request #1965 from adrn/docs-typo

Fix minor typo in coordinates docs
Clarify the GPS format in the docstring
Tweak docstring per @eteq suggestions
Merge pull request #1879 from taldcroft/time-gps-doc

Update docstring for GPS time format to clarify meaning of this format
Merge pull request #1970 from mdboom/testing/pytest-2.5.1

Upgrade to py.test 2.5.1
Fixed logger for Python 3.4
Fixed format calls for Python 3.4
Added CHANGES entry
Fixed cosmology test for Python 3.4
Implement suggestions from @mdboom by removing :s from e.g. {0:s} since the :s is redundant and does not work in Python 3.4
Non-integer shapes will be unsupported in a future version of Numpy.
Turn DeprecationWarnings into exceptions during testing.
Add CHANGES entry.
Ignore Scipy-related deprecations.
Fix deprecation handling self-test
Prevent deprecation warning on Python 2.6 because division automatically
converts to float
Warn, don't raise exception, if a package has no documentation section.
Ignore a deprecation warning produced by py.test on Python 2.6