Introduces rebin_cubeHDU function to image utils. Test case still to be done
Introduces cube option into rebin_cubeHDU
Adds unit test and makes minor changes to the rebin_cube_hdu function
Introduces new test cases for calc_footprint and block_reduce_hdu, improves the code for block_reduce_hdu in gammapy/image/utils.py
Debugs axis order issue for test_utils.py and utils.py in gammapy.image
Further debugging of the calc_footprint and block_reduce_hdu functions in gammapy.image and updates test cases
Fixes Reference Pixel bug to ensure footprint is preserved after rebinning
Merge branch 'master' of github.com:gammapy/gammapy into image_rebinning
Updates docstrings and reformats code
Debugs calc_footprint, adds a test to check invariance of lower left corner pixel using block_reduce_hdu and updates docstrings in the new code
Ensures dependencies are marked correctly in image test_utils
Merge pull request #88 from ellisowen/image_rebinning

Image rebinning