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 pull request #432 from jabooth/fitterpy

aam.fitter, clm.fitter, sdm.trainer packages
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 regression_features_check

Conflicts:
	menpo/fitmultilevel/test/sdm_test.py