Add missing super
Port AvoidGlobalVars to AST::Processor
Port MethodLength to AST::Processor
Ruby 1.9 fix
Port ColonMethodCall to AST::Processor
Port WhenThen to AST::Processor
Port VariableInterpolation to AST::Processor
Port if_then_else to Parser.

Ported cops: IfWithSemicolon, MultilineIfThen, OneLineConditional.