defines extract_parametric_features and documents them
defines extract_parametric_features and documents them

mozata/menpo,patricksnape/menpo,yuxiang-zhou/menpo,mozata/menpo,mozata/menpo,grigorisg9gr/menpo,patricksnape/menpo,yuxiang-zhou/menpo,grigorisg9gr/menpo,menpo/menpo,menpo/menpo,patricksnape/menpo,menpo/menpo,mozata/menpo,grigorisg9gr/menpo,yuxiang-zhou/menpo