added test_imports to make sure all packages successfully import
Added fix for configuration file causing exception when importing astropy from source.
Fixed astropy/__init__.py to better clean the namespace
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
I've been noticing that every time I did a build with a different Python version I was still having to rebuild the wcs module every time I switched between versions, even if there were no code changes.  The reason was due to subtle string escape differences--Python 3 was writing '\0' while Python 2 was writing '\x00'.  Likewise Python 2 was escaping ' as \' while Python 3 was not escaping it.
Update CHANGES.rst

Added an empty changelog section for 0.2 line of release.  Any changes that will be backported to 0.2.x that have been made since 0.2b1 should be listed there.  I need to go through myself and make sure this is properly groomed before doing the next 0.2.x release.  Note that assuming the next such release is 0.2b2 then everything under this 0.2 section will become the changelog for 0.2b2, and a new 0.2 section will be added.  At some point this process needs to be better documented.
Merge pull request #667 from iguananaut/wcs/fix-docstring-diffs

Fix trivial differences in wcs/src/docstrings.c between Python versions
Merge pull request #625 from astrofrog/add-license-line

Added LICENSE line to files that were missing it
Merge pull request #458 from eteq/test-imports-2

added test_imports to make sure all packages successfully import
Merge pull request #655 from eteq/configuration-fix-src-import

Fix configuration generation to not crash source import
Add "unclosed file detection" to the testing framework.

Fix unclosed file bug in logger.py
Fix unclosed file bug in wcs.
Fix unclosed file bug in io.ascii.
Add open_file_detection_test