Updated the licensing information in many files.
This is a broken commit because I decided to do this at a bad time. Sorry! The build will be working after next commit, I promise (and I won't push till then). This commit reflects the licensing in the files after I used my auto-add/remove script.
Finished skeleton of cliffsensor node. Compiles.
Added buttons and cliffsensor ROS nodes. Everything except for src/<node>.cpp file functions have been changed.
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