First pass at getting spectral-cube's yt interface up to speed with the latest changes in yt 3.0.
Attempting to get some feature parity between yt 2.x and 3.x
Attempting to get better convergence between yt 2.x and 3.0 implementations of to_yt
Adding a yt2world method, cleaning up the documentation a bit
Needed this line
Cleaning up documentation
Followed @astrofrog's suggestion and made these methods take the spectral_cube argument
yt installation line for Travis
Only allow yt tests for recent numpy versions
Only need to test 1.7
Replacing pf with ds to reflect yt 3.0
Some unit tests for yt
Adding assert_array_equal for integer ndarrays
Most of these tests pass now, but there's a nasty bug that I need to track down.
These tests won't pass completely until yt 3.0.1 is installed in Anaconda.
Merge branch 'master' of http://github.com/jzuhone/spectral-cube

Conflicts:
	spectral_cube/spectral_cube.py