added empty directoy for cmu mocap data
Merge branch 'devel' of github.com:SheffieldML/GPy into devel
merge branch 'devel' of github.com:SheffieldML/GPy into devel
sparse_GP now has a separate predict function

GP and sparse_GP used t share a predict fumction. Since we'd like to
propagate uncertainty in predictions, sparse_GP.predict needs to accept
X_new_variance.
used scipy.weave to improve the speed of rbf grads

for large number of input dimensions with ARD, wqe have approx tenfold
speedup.
Merge branch 'devel' of github.com:SheffieldML/GPy into devel