BUG: fix kde tests
DOC add missing links to the scorer and classication section
TST better testing of the PLS module

Now checks it returns the correct number of components, and not just the
maximum number of components.
FIX PLSSVD now returns the correct number of components

closes #1312
COSMIT small documentation tweaks
cosmit typo
ENH rename eval / pseudolikelihood to score_samples