ind ops
import not relative in tests
chancges to where gradients are computed in laplace
more chancges to laplace
lots of fixes, including prediction being mean and variance only
various fixes in likelihoods, esp studentT and plotting
fixed the posterior prediction for laplace

The mis-match between the woodbury vector and KIf is still a bit of a
mystery
Merge branch 'params' of github.com:SheffieldML/GPy into params