Revert #405 Arel patching due to regression

“lib/ransack/adapters/active_record/compat.rb:24:in
`<module:Visitors>': superclass mismatch for class ToSql (TypeError)”

lib/ransack/adapters/active_record/compat.rb

@@ -1,50 +1,14 @@
 module Arel
 
-  module Nodes
-    %w{
-      IDoesNotMatch
-      IMatches
-    }.each do |name|
-      const_set name, Class.new(Binary)
-    end
-  end
-
-  module Predications
-    def i_matches other
-      Nodes::IMatches.new self, other
-    end
-
-    def i_does_not_match other
-      Nodes::IDoesNotMatch.new self, other
-    end
-  end
-
   module Visitors
 
-    class ToSql < Arel::Visitors::Visitor
-      def visit_Arel_Nodes_IDoesNotMatch o
-        "UPPER(#{visit o.left}) NOT LIKE UPPER(#{visit o.right})"
-      end
-
-      def visit_Arel_Nodes_IMatches o
-        "UPPER(#{visit o.left}) LIKE UPPER(#{visit o.right})"
-      end
-    end
-
-    class Dot < Arel::Visitors::Visitor
-      alias :visit_Arel_Nodes_IMatches            :binary
-      alias :visit_Arel_Nodes_IDoesNotMatch       :binary
-    end
-
     class DepthFirst < Visitor
 
       unless method_defined?(:visit_Arel_Nodes_InfixOperation)
         alias :visit_Arel_Nodes_InfixOperation :binary
-        alias :visit_Arel_Nodes_IMatches            :binary
-        alias :visit_Arel_Nodes_IDoesNotMatch       :binary
       end
 
     end
 
   end
-end
+end