precise docs and cleaner naming for classifiers
CLMBulder takes classifier_trainers
Merge remote-tracking branch 'upstream/master' into classifier_tidy
support for callable classes rather than closures
Merge remote-tracking branch 'upstream/master' into classifier_tidy
Merge pull request #433 from jabooth/classifier_tidy

tidy classifiers
Merge remote-tracking branch 'upstream/master' into warp_to_mask

Conflicts:
	menpo/fitmultilevel/clm/builder.py