rename README file
add long_description
add github link as download url
minor documentation update
bugfix --- check for CUTOUT_SUPPORT in local_tools
require CUTOUT_SUPPORT for interpolateBoxFilter
bugfix --- don't assume h5py present
check for h5py in libJHTDB.py
only import cutout if h5py present
test: only import cutout if h5py present
bugfix: move cutout import under try, not except
only define clean_2D_field if plt and cm present
bugfix: getFilteredPosition needs CUTOUT_SUPPORT

because I'm using interpolateBoxFilter, which uses DataSets, which I
think uses the cutout thing. maybe.
another item on the TODO list
add installation instructions for ubuntu
Merge branch 'develop'