np_divs: save kNN distances for all K again

to let jensen-renyi work transparently, for equal size samples anyway
jensen-renyi divergence (for equal sample sizes)
minor bugfix
whoops, typo
add names_only option to read_features
Merge branch 'master' into jensen-renyi
Merge branch 'master' into jensen-renyi
Merge branch 'master' into jensen-renyi

Conflicts:
	sdm/sdm.py
Merge branch 'master' into jensen-renyi

Conflicts:
	sdm/sdm.py
another fix that was on jensen-renyi but not master :|
Merge branch 'master' into jensen-renyi
Merge branch 'jensen-renyi'