HyperGeometric2F1(a​, b, z)

The whole file is ported from C using this submission:
http://www.mathworks.com/matlabcentral/fileexchange/43865-gauss-hypergeometric-function
The idea is to provide a file that doesent need to be compiled. Additionally I vectorized the calculation to improve speed significantly. An example usage is given in the header of the file. Since I just translated the function from C to Matlab, I cannot guarantee that the results are always correct but I tested it using many different inputs. If you find any errors please write a comment.