Incoming regular expressions were being converted to the wrong type. Fix

for invalid character error in the step matching.

lib/rhino/java.rb

@@ -7,6 +7,10 @@ module Rhino
   #   Rhino::J::NativeObject # => org.mozilla.javascript.NativeObject
   module J
     import "org.mozilla.javascript"
+
+    module Regexp
+      import "org.mozilla.javascript.regexp"
+    end
   end
 end
 
@@ -17,4 +21,4 @@ unless Object.method_defined?(:tap)
       self
     end
   end
-end
+end

lib/rhino/wormhole.rb

@@ -8,6 +8,7 @@ module Rhino
       when *JS_UNDEF          then nil
       when J::Wrapper         then object.unwrap
       when J::NativeArray     then array(object)
+      when J::Regexp::NativeRegExp then object
       when J::Function        then NativeFunction.new(object)
       when J::Scriptable      then NativeObject.new(object)
       else  object