Add basic slice support to positivify.
Add a docstring to positivify.
Add better support for slices to positivify.
Merge branch 'master' into feature/add-slicing
Fix indexing errors by using Integral instead of int.
Merge branch 'master' into feature/add-slicing
WIP: Add failing slice test.
Add a tuple_intersection function to metadata_utils.
Add slice support to dist/maps (for BlockMap)...

and NoDistMap.
Add slice support to local/maps (for BlockMap).
Allow multiple results through.

Slicing is kind of working!
Merge branch 'refactor/restrict-use-of-checked-getitem' into feature/add-slicing

Conflicts:
	distarray/dist/distarray.py
Unwrap a docstring.
Slicing works for __getitem__.
Fix positivify's behavior with slices.

Slices shouldn't be bounds checked.
Don't test for int, test for Integral
Add `targets` arg to context.apply calls

in DistArray.from_localarrays.
Factor sanitize_indices out into metadata_utils

and reuse it on the client side.  Also factor out a _process_return_value function.
Fix positivify and add regression tests.
Get rid of reference to old `client_map` module