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Drop vendored copy of indices and uses thereof (#56)

* Rewrite `center_of_mass` to use `arange`

Instead of using the vendored `indices` function to multiply the image
with, rewrite `center_of_mass` to just use `arange` and rely on Dask to
handle the broadcasting when multiplying with the image. Should be a bit
more efficient and should avoid the need for a compatibility function
using `indices` in `center_of_mass`.

* Rewrite `_ravel_shape_indices` without `indices`

Instead of relying on a vendored copy of `indices` to construct the
raveled shape indices, just use `arange` for each dimension and rely on
Dask to handle the broadcasting for us. Also handle any scalar
multiplication that would occur within the arguments to `arange`. This
creates a much simpler Dask graph and avoids relying on a vendored copy
of `indices`.

* Drop note in `_ravel_shape_indices`

As we now are leveraging just `arange` to handle construction of the
indices in `_ravel_shape_indices`, this note no longer applies. Plus we
are better able to handle chunking with what we are doing in this code
than would happen with `reshape` naively. So this really isn't a
workaround any more, but an efficient solution to the problem.

* Drop vendored copy of `indices`

As we are no longer using `indices` in `ndmeasure`, we no longer need to
include a vendored copy of `indices`. So go ahead and drop this function
from the `_compat` module.

* Drop tests for vendored `indices`

As we no longer include a vendored copy of `indices` in `ndmeasure`,
there is no need to have tests for it. So go ahead and drop the tests.

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