move checks out of DeformableModelBuilder
move key builder classmethods to simple functions
unify mean_pointcloud, small tidying
validate_features -> check_features
Merge pull request #430 from jabooth/funcfitmulti

Remove classmethods from DeformableModelBuilder
Merge remote-tracking branch 'upstream/master' into tidyfitmlfuncs
move AAMFitters to aam.fitter
move AAM/PatchBasedAAM to aam.base from aam.builder
adds clm.fitter package, rearranged to be as SDM is
SDM moved to similar package structure as CLM/AAM
Merge pull request #431 from jabooth/tidyfitmlfuncs

More fitmultilevel tidying
precise docs and cleaner naming for classifiers
CLMBulder takes classifier_trainers
Merge remote-tracking branch 'upstream/master' into fitterpy
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
unified check_feature check_regression_feature
remove classmethods from SDMBulder, fixed docs