various tweaks, rand for noncentral
Kolmogorov distribution and KS tests
added kolmogorov tests, fix out of bounds cdf
inverted gamma: enable tests, fix entropy
Merge pull request #102 from simonbyrne/master

various tweaks, rand for noncentral distributions
Merge pull request #103 from simonbyrne/kolmogorov

Kolmogorov distribution and KS tests for rand vs cdf
Merge with recent kolmogorov PR