Added document normalizers
+ CS fix with php-cs-fixer
Separate out token preparation step

Token prep was occurring within an unrelated transform. This step is now
separated out into its own transform
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
Added new stemmer normalizer

Based on a php extension php-stemmer (https://github.com/hthetiot/php-stemmer.git)