altered some todo comments in robot
added pprint to core
changed damage from '0 to 100' to '100 to 0' -- i.e., it should be called health instead
fixed brain-test to conform to new format of test-programs programs
removed passing of tick-duration down into brain and robot

replaced with dynamic "constant" *GAME-SECONDS-PER-TICK*,
so we can alter it during tests
fixed tests for robot-test so they use dynamic *GAME-SECONDS-PER-TICK*
removed world helper functions made extraneous by lack of tick-duration variable
moved constants out into their own file
added animate module. works.
added comments to :moving-to-spot test program
reworked hacky sandbox stuff in core.clj, to help with animation
fixed typo in animate
got compojure going, with a few sample routes