Rename README to README.rst and add line breaks
Fixes array broadcasting in spectral cube and adds unit test

Fixed doc links
Add crab_mwl SED dataset as one FITS file
Merge branch 'master' of github.com:gammapy/gammapy
Add crab_mwl_sed tutorial with plot
Merge pull request #141 from ellisowen/spec_cube_bug_fix

Spec cube bug fix
Remove xfail marker from tests that pass
update