MSD fftpack warning

[Bradley Dice]

I got this warning when calling msd.compute(). Might be nice to fix (or hide) before the official release of msd.

/home/bdice/anaconda3/envs/dice/lib/python3.6/site-packages/scipy/fftpack/basic.py:160:
FutureWarning: Using a non-tuple sequence for multidimensional indexing is deprecated;
use `arr[tuple(seq)]` instead of `arr[seq]`. In the future this will be interpreted as an array
index, `arr[np.array(seq)]`, which will result either in an error or a different result.
  z[index] = x

[Bradley Dice]

This is probably resolved by using a newer SciPy. Won't fix.