Write gammapy.image.utils.lookup function docstring
Merge pull request #45 from ellisowen/lookup_docstring

Write gammapy.image.utils.lookup function docstring
Add random sampling functions to utils
Add gammapy.utils.random module to sphinx docs
Drop astropy 0.2 support.
Merge branch 'master' of github.com:gammapy/gammapy
Update detect and image code for astropy 0.3
Merge pull request #48 from cdeil/random_sampling

Random sampling
Update test_matched_filter unit tests
Add examples/add_gnomonic_projection.py

This is an old script that need to be refactored to be useful.
Add examples/horizon_coord_transformations.py

This is an old script that need to be refactored to be useful.
update spectrum/isrf.py code a bit
Merge branch 'master' of github.com:gammapy/gammapy
Update spectrum docs
add license line
Clean spectrum sub-package code a bit.
Add spectrum test_diffuse.py file
Add Reference/API section label to docs
Add Crab HESS spectrum flux points as example data file
Move gammapy.astro to gammapy.astro.source

I think in this case splitting astro into sub-packages
(source, population) makes sense.