Added document normalizers
+ CS fix with php-cs-fixer
Merge branch 'qapa-optimization'

Conflicts:
	src/Camspiers/StatisticalClassifier/Classifier/ComplementNaiveBayes.php
	src/Camspiers/StatisticalClassifier/Classifier/SVM.php
	src/Camspiers/StatisticalClassifier/Transform/TokenCountByDocument.php
	tests/Camspiers/StatisticalClassifier/Transform/TokenCountByDocumentTest.php