Retrieve version from git, post github migration
Protect certain setup parameters with sys.platform

 * Allows setup to run where py2exe is not available
adding ROS files
Handle when creation of version.py is not possible

 * Catkin (non-standardly) builds from outside source dir
Merge branch 'ros-hydro' of https://github.com/mchenryc/crazyflie_clients_python into mchenryc-ros-hydro
Merge branch 'mchenryc-ros-hydro'