add 1d and 2D wstat
Set use_2to3=False in setup.py
Make gaussian_sum_moments work without 2to3
Make test_psf.py work without 2to3
Clean up things pointed out by 2to3
Merge pull request #109 from cdeil/issue_109

Make gammapy Python 2/3 compatible without 2to3
Fix IndexError in ring.py
Add bbox utility function
Fixes bug in cube_to_image function for case where no slicepos given
Removes dtype from cube_to_image summing case, introduces make_uniform_image to produce an image of ones (required in the test case) and introduces a test case for cube_to_image
Adapt to changes in astropy.coordinates
combines functionality of make_empty_image and make_uniform_image and adds checkerboard option. Updates docstring for make_empty_image and updates the unit test
Changes fill options for make_empty_image function in gammapy.image.utils
Minor formatting change
Merge pull request #113 from ellisowen/cube_to_image_bug_fix

Fixes bug in cube_to_image function for case where no slicepos given
Update .travis.yml to make coveralls work and add Python 3.4
update README
Merge pull request #114 from cdeil/issue_114

Make coveralls work for gammapy
Fix import in gp-sherpa-like
Add docs/image/survey_example.py