Put calibration in its own method
Change photosensor to sonic in specification
Move pinModes to setup
Declare motor pins
Set mode of motor pins to output
When the sonic sensor is covered, the robot moves backwards

Both motors are connected to M2
Rename sonic sensor pins in anticipation of addition of another sonic sensor
Have the robot roll backward if somethign is sensed in front

It works... on occasion...
Merge branch 'master' of https://github.com/quinston/scurryant

Conflicts:
	scurryant.ino