Add MustCallSuper rule
Fix comments from review on ObjCVerifyMustCallSuperRule
Add suppression test for ObjCVerifyMustCallSuper
Style changes based on review for ObjCVerifyMustCallSuperRule
Switch to oclint:enforce[rule name] annotation
Improve error message of must call super rule. Fix dogfooding problems
Rename 'usage' to 'cocoa' for must call super rule
Add back moved files. Improve test story
Factor out utility method
Merge branch 'must-call-super' of https://github.com/aleffert/oclint into aleffert-must-call-super
Remove extra empty line