Added license boilerplate to all Python files. Added attempt to load manifest to main files. Enclosed subsequent imports into try/catch. If they fail, issue error message that advises of unavailable roslib, and consequent need to set pythonpath manually. In gesture_buttons: modified flick direction detection to use global coordinates. Local coordinates interpreted east and west flicks as south.
Bumped robhum_ui_utils version number to 0.1.7