Quadrotor

Revision dd56aeef

Added ncurses for key input. It can now publish at a rapid rate because
the key input is non-blocking, and after it exits the terminal is not
screwy, but it's not an ideal solution because ROS_INFO no longer works.

Encapsulated the stuff in nav_lib into a class, MikrokopterControl.

rosbuild_add_executable(externctrl_client src/externctrl_client.cpp)

rosbuild_add_executable(keyboard_control src/keyboard_control.cpp src/nav_lib.cpp)

target_link_libraries(keyboard_control ncurses)

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