NEW: GPIO11 toggles on encoder finish/ROS message publish

NOW DEPENDENT ON bcm2835 LIBRARY, SEE http://www.airspayce.com/mikem/bcm2835/index.html
	built under normal circumstances (./configure, make, sudo make install)
	installed to /usr/local: bcm2835.h in include, libbcm2835.a in lib

	ROS path setup added to [root]/.bashrc to invoke 'sudo -i rosrun ...'

Other changes:
	Starts encoder on node launch, after starting service/publisher adverts
	Uncommented debug messages from fpasteau's original branch

TODO:
	syncable/triggerable captures (even possible?)
	incorporate newer raspivid/raspistill code (framerates > 30, mostly)