This minor update basically adds the following:
- Few @SuppressWarnings were added to get rid of some annoying compilation warnings
- Added mark/unmark capability on any node in the graph. Marks can be default boolean flags, or any other Object can be associated with the node as a mark, which can be inspected on demand via method getMark.
- Method get(node) was added to allow consumers to retrieve the exact node instance that was previously added to the graph.