refactored parse and parse-token (parse-token is back to original)
changed robot.brain to require kernel-lexicon to be fully qualified.
updated docstrings in brain.clj
rearranged dependencies so that all calls to foundry/assemble are made from brain/init-brain, and higher levels pass in source code to init/brain
rearranged order of arguments to parse, parse-token and assemble, to make more sense
rearranged dependencies so the register names are known only to robot, and passed in function calls to brain
removed commented out debugging line
changed keyword 'program' to 'obj-code' (more specific)
whitespace change to brain-test
got basic skeletons of robot and world up and running, all tests but one passing in brain-test