Allow calling `array` or `asarray` on DistArrays.
Add a test for __array_interface__.
Test setting ndarray slices with distarrays.
Make sure dtype is cast to a numpy dtype.
Test some more.
Merge pull request #473 from enthought/feature/enhance-distarray-to-array-conversion

Enhance distarray to array conversion (implement `__array_interface__`)
Merge pull request #474 from enthought/refactor/setitem

Refactor setitem
Merge branch 'master' into feature/test-0d-arrays