Implements N3644.

- Avoid deriving from std::iterator_traits as iterators become too fat.
- Use intrusive's reverse_iterator some std::reverse_iterator-s don't value initialize base.

test/scoped_allocator_adaptor_test.cpp

@@ -115,7 +115,7 @@ enum ConstructionTypeEnum
 {
    ConstructiblePrefix,
    ConstructibleSuffix,
-   NotUsesAllocator,
+   NotUsesAllocator
 };
 
 //This base class provices types for