Fix galactic function
Add gammapy.astropy.population.simulate
Add old scripts to simulate model Galaxies
Merge pull request #116 from cdeil/pop-study

Add code to make model Galactic source catalogs
Mark some test that require scipy
Python 3 fix in simulate.py
Update mode of gp-pf-cta-irf-root-to-fits
Update pop simulation scripts
Remove .py from pop simulation scripts
Extend gp-gsim-cat-gal
Merge pull request #117 from cdeil/pop-study2

Improve synthetic Milky Way modeling
Implement wcs_histogram2d in image utils
Fix axis order in wcs_histogram2d
Add spectral_cube sub-package
Add API docs for utils.testing
Move spectrum.diffuse.GalacticDiffuse to
spectral_cube.core.GammaSpectralCube
Add datasets.get_fermi_diffuse_background_model
Add examples/fermi_diffuse.py
Add LogEnergyAxis class
Implement GammaSpectralCube class