Much faster kde
Much faster kde

* Using statsmodels (which may be slightly difficult to install) makes
  for a very fast kde (using fft's)
* In addition, it makes sense to compute all of the slices ahead of time
  (otherwise we become dominated by calling classes)

To investigate:
- Do we need to use statsmodels? It was a little difficult to install.
- It would be better to have a more robust method for determining
  bandwidth

williamjameshandley/fgivenx