Move all data files to gammapy/datasets/data
Adjust datasets paths after moving files
Move datasets/__init__.py to datasets/load.py
Add datasets/make.py
Rename datasets test_all.py to test_load.py
Adapt test file locations
Merge pull request #119 from cdeil/issue_119

Move data to gammapy/datasets/data
Remove Python 3.2 tests on travis-ci temporarily
Remove image.calc_footprint