Create class for tree nodes.
Add compute_tree.
Modify comments.
Add pretty printer, and a new test file.
Take into account Thomas' comments.
Fix indent.
Remove trailing whitespaces.
More pythonic/efficient style.
Do not use a mutable as default argument (can cause really hard to debug errors).
Merge pull request #4 from ProjetPP/parsetree_to_triple

Nice object to manipulate StanfordCoreNLP results