rework ranking explanation
Merge remote-tracking branch 'origin/tmp-master' into ranking_explanation_asutcl
Refactoring of explanations
fixed code error due to mahtod signature change in tests
Merge remote-tracking branch 'origin/tmp-master' into
ranking_explanation_asutcl

Conflicts:
	src/main/java/ca/mcgill/cs/creco/logic/ConcreteServiceFacade.java
removec debugging and logged errors
Sorting Fix
Merge remote-tracking branch 'origin/tmp-master' into ranking_explanation_asutcl
features test
Merge remote-tracking branch 'origin/tmp-master' into
ranking_explanation_asutcl and added correlation sort as default #79

Conflicts:
	src/main/webapp/js/features_form.js
Fixed to correlatoin