slicing now returns the right shape, when computing derivative wrt X or Z
slicing finished with independent outputs
pickling working for array-likes, but observers not yet connected back
merge conflict
ObservableArray -> ObsAr, because of pickling and ndarray printing
Merge branch 'params' of github.com:SheffieldML/GPy into params

Conflicts:
	GPy/likelihoods/gaussian.py