python interface tutorial
add python move_group interface tutorial
python tutorial: add MoveGroupCommander interface
python tutorial: add go command
python tutorial: fix typo
python tutorial: fix title
python tutorial: fix display_trajectory_publisher
python tutorial: add joint state plan
python tutorial: add cartesian paths
python tutorial: update expected output description
fix copyright and link
Merge pull request #38 from ros-planning/python_tutorial

Python tutorial