MappingIterator renamed from LazyCallbackIterator.
Updated protected API.
offset* methods are now contain the implementation. The other methods refer to them instead of the other way around.
Bug fix for SortedMap. When setting a value for a key that already existed, the value was not updated.
Added some performance tests for maps.
Inlined rotateSingle* for performance reasons.
Fixed bug and bad test.
Added subset/superset comparisons.
Merge pull request #6 from morrisonlevi/master

Updating