Did some stuff with a song, changed the interface for detecting bumps, cliffs, and things, added stub for white stuff
song fixes
bad code
fixed main to include case statement
Play song stuff
fixed indentation
Merge branch 'dwtj-master'

Conflicts:
	rover/src/open_interface.c
	rover/src/servo.c
Merge pull request #6 from dwtj/master

Converted all 4-spaces to tabs in c-files to make consistent style.
made struct, refactored
Merge branch 'dwtj-master'

Conflicts:
	rover/mars-rover.c
	rover/src/servo.c
Err done a lot of stuff last night.
small fixes
Merge branch 'master' of https://github.com/asr1/mars-rover into asr1-master
Moved song logic from the `mars-rover.c` to its own subsystem, `songs`.