Merge pull request #11 from nortikin/master

handle lists instead of tuples.
Merge pull request #12 from nortikin/master

updates
Formattiing change
Allow negative index -1 is last and so on.

Adding functionality by removing code. A first
Merge pull request #13 from nortikin/master

update my fork
Merge pull request #18 from ly29/master

Change of ListItem Node.