Add component: statistical comparison

[raamana]

Missing functionality: non-parametric friedman test on the results from RHsT

[dinga92]

is this and #2 to allow comparison between multiple classifiers on multiple datasets according to demsar 2006?

[raamana]

Hi Richard, mostly yes.

I separated them to identify them at different levels.

Did you get a chance to go through the code?

[raamana]

Also, take a look at this one: https://github.com/maximtrp/scikit-posthocs