After run of 2to3
Fixed import issue in radiation - circular import
Revered query_usno.py, keep that as Py2
Fixed Py3 issue in constants
Merge branch 'master' of github.com:robintw/Pysolar
Added new trove classifiers to setup.py to show it works with Python 2 and Python 3
Merge pull request #11 from robintw/master

Add Python 3 support. Thanks, Robin!