Added compatibility with yt 3.0
Fix compatibility with yt 3.0.1
Update .travis.yml to install yt 3.0.1
Added changelog entry [ci skip]
Try and pip install Cython
Fixes to octree loader
Added -Wno-error=declaration-after-statement to setup.py as a temporary workaround for a Python 3.4 bug.
Fix yt AMR exporter
Make yt tests a little harder to make sure that grids with uneven number of elements along each dimension work.
Simplify .travis.yml builds and require yt to be installed in Python 2.7 for tests
Merge pull request #113 from astrofrog/yt-3.0

Implement compatibility with yt 3.0