Add Ellipsis support to __getitem__ slicing

[bgrant]

Based on #384.

See http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html for details on the Ellipsis object.

[kwmsmith]

@bgrant are these ellipsis edge cases covered? We should have tests for them:

arr = np.ones((10, 20))
assert allclose(arr[..., ..., ...], arr[:, :]) # extra ellipses are ignored.

zerodee = np.array(0)
assert zerodee[...] == zerodee # ellipsis can be used with 0D scalars as well.

[bgrant]

Regarding how Ellipsis works: it is as described here: http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html

But numpy may work differently now (you mentioned in person that the numpy source looked like it had changed).

[bgrant]

Additional tests added in e394e51

[bgrant]

@kwmsmith : Comments addressed.

[coveralls]

Changes Unknown when pulling e6f8bdc on feature/add-ellipsis-support-to-slicing into * on master*.

[kwmsmith]

👍