Changed a check for whether all the data is unique to be much, much faster. This can speed up fitting by a factor of two for data sets >10,000 elements.
Added simulated data generators for non-power law distributions.
Fixed a misplaced variable in Stretched Exponential pdf calculation. This was a
typo in the Clauset et al. paper, I think. Still having some issues with random number generation.
Updated Lognormal and Stretched Exponential random number generators.
Fixed Stretched Exponential, so that PDF, CDF, and random number generators all
use Wikipedia's structure. This ensures that all three work correctly together,
as the previous versions I was using did not.