changed the stuff about iterator_category in reverse_iterator to match

the language we decided on for filter_iterator


[SVN r21687]

libs/iterator

@@ -1 +1 @@
-Subproject commit c6a5b7c292c819b897329d6e27c4ac4108f93482
+Subproject commit ea3baba3768883d96ce0e1ce032172e8024d0110