Add docs describing bounding boxes
Work on BoundingBox code
Merge pull request #80 from cdeil/issue_80

Fix image.utils.cut_out
Added astropy-helpers to RTD pip requirements
Improve FermiPSF
Move PSF from morphology to irf sub-package
Add setup_package.py to gammapy/irf
Add fermi_model.xml
Move other PSF files from morphology to irf
Update setup_package.py files
Fix imports after moving morphology.psf to irf.psf
Rename PSF file names
Fix PSF imports after renaming
Improve morphology/gauss
Continue implementing table PSF classes
rename psf_fermi to psf_table
Add plot_effective_area.py
Add plot_energy_dispersion.py
Add plot_fermi_psf.py
Add effective_area, energy_dispersion and psf docs