Use Angle consistently; clean up cube_convolve function and example
Merge pull request #174 from cdeil/npred_cleanup

Minor cleanup of convolve_cube and npred_demo.py
Rename `spectral_cube` to `data`
Rename GammaSpectralCube to SpectralCube
Move gammapy/data/core.py -> gammapy/data/spectral_cube.py
Make build for gammapy.data work
Add gammapy/data/event_list.py
Merge pull request #176 from cdeil/spectral_cube_to_data

Move `spectral_cube` to `data` sub-package
Clean up imports
Move gammapy/detect/utils.py -> gammapy/detect/scale_cube.py
Clean up imports
Merge examples into tutorials in the docs description.
Improve installation instructions
Merge pull request #177 from cdeil/import_cleanup

Clean up imports
Clean up datasets
Merge pull request #180 from cdeil/cleanup_datasets

Clean up datasets and add some docs
Add missing scipy skipt ot test_fermi.py
Update astropy_helpers sub-module pointer to v0.4.1
Update MANIFEST.in
Merge pull request #182 from cdeil/ah_update

Update astropy-helpers and MANIFEST