timtadh/zhang-shasha — pull request #21 by timtadh (2014-11-03 19:41:09+00:00)
Title: Removed requirement that node is a normal object

Before I required that each node was a normal python object such that an
arbitrary attributed could be added. I was adding an `_id` attr to while
building the AnnotatedTree. This was unnecessary. I now store those much
more sensibly in a seperate list.

fixes #20