Move LeftRB class methods for min and max into BinarySearchTree.Node class.
Move LeftRB class method for tree size into LeftRB.Node class and fix the size calculation.
Remove print statements.
Make search more Pythonic. Add tests.
Move height and insert into Node. Other small fixes.
Add tox.ini for continuous integration with different Python versions. Update runtests.py.
Move _fix_up(), _flip_colors() and __setHeight() into Node class.
Move _move_red_left and _move_red_right into Node class.
Move left and right rotations into Node class.
Bump version number to 0.1.3.
Change h to self in doc string.
Fix a bug with getting None from _move_red_left() and _move_red_right() functions.
Output left and right keys of a node on repr().
Fix height estimation on test.
Move _delete(), _delete_min() and _delete_max() into Node.