More Python 3 fixes
More fixes
Use string type for categorical data because Python 3 cannot sort list with mixed float and string types
Added workaround for Astropy bug in Python 3
Fixed more tests
Fix img_data factory when PIL is not present
Fix object comparison in Python 3
Fix comparison
Fix categorical data so that it uses strings but can use NaN or None to indicate no category
Fix test failure in d3po exporter
Test everything except glue/qt in Python 3.4
Fix PATH
Fix Python version
pyside is not available in anaconda for Python 3.x
Fix syntax
Fix syntax
Fix plotly test
Check that categorical data is of uniform type
Proper fix for inequality - was originally a bug
Explicitly set attribute names