Port of Antti Niemesto's max likelihood code

This code implements a thresholding method from Antti Niemesto's HistThresh MatLab Toolbox
Fix documentation errors re: author credits
Update min thresh method to reflect latest changes

Antti Niemisto updated his implementation of the minimum threshold method.
We update our code to match his 1.03 version from his HistThresh matlab
toolbox.
Update minimum threshold method with better algo

Algorithm as specified by Antti Niemisto in ij-dev mail list 2-18-13
Update imports