Total Rewrite (includes literal port of gpml MATLAB)

Total rewrite.  Implemented all funcitonality to replicate both
demoRegression and demoClassificiation (with hardcoded inputs).  Need
to optimize the code (with things like linalg.solve_triangular for
cholesky solves).  Also, need to implement a "real" cholupdate
(currently does a full Cholesky).  Need an optimization capability that
works.  min_wrapper doesn't seen to converge to minimize.m  Also, need
a better directory structure and an object oriented way to call the
covariance, mean liklihood and inference functions.