validate_multiple: do k-fold on multiple classifiers, popularity vote
Added kmean clustering
Added PCA reduction and more classifiers
Merge branch 'master' of github.com:fabeschan/facial_expression

Conflicts:
	main.py
Fix averaging of cross_validation scores

also some updates of using kmeans
Add kmean clustering + evaluation
Added PCA after Kmean
Minor changes
Add filtering options; and display rates based on identity
Play around with LBP and try to scale both test and tr together

(cherry picked from commit 4822bb6d927b6eea2dcde9489a1df07bf83a85e0)

Conflicts:
	main.py