Add more badges to README
Add LONG_DESCRIPTION.rst
Read LONG_DESCRIPTION from LONG_DESCRIPTION.rst in setup.py
Merge pull request #190 from cdeil/badges_and_description

Status shields and LONG_DESCRIPTION
Updates the Index RST file with slightly new gammapy background value
Updates plotting scripts for npred cube
Updates plots in npred tutorial
Changes to mirror convolution for edged in spectral_cube, npred
Merge pull request #189 from ellisowen/npred_plots

Uses Aplpy FITSFigure in Npred plots
Adds iterative background kernel estimation code to gammapy.background
Adds unit tests for new iterative background kernel estimation code
Updates background init.py file to include background estimation code
Adds background iteratative estimation tutorial RST file
Adds tutorial plotting script
Updates tutorials index.rst file to include new background tutorial