Switched from ATpy to Astropy for tables. Included FITS reader/writer for backward-compatibility with Astropy 0.2.
Added note about fits_io.py file
Make ASCII identifier work with Astropy 0.2 and 0.3.dev
Only register FITS readers/writers if they are not already registered
Remove TabularData and refactor uses in examples
Remove references to ATpy
Updated data tutorial doc
Removed remaining atpy references
Fill masked values with NANs
Updated .gitignore
travis setup
Factor out aplpy dependency
Don't let pytest mess with stdout with IPython=0.12
Added license information for APLpy
Added test submodule. Allows python -m glue.test to run test suite
Merge pull request #152 from ChrisBeaumont/travis

Travis
Added license
travis setup
Factor out aplpy dependency
Don't let pytest mess with stdout with IPython=0.12