refactored the following in lab4 Start from fresh :

	   absracted out abstract Driver class, zig zag extends this
turned out i was changing lab3 instead of lab4, so i just found out what i wrote, and rewrote it
removed pause() , unpause() , isPaused() method in Drivable interface.
removed pause() , unpause() , isPaused() method in Driver abstract class.
added an abstract method handleObsticle() in Driver class to handle wall detection ahead
prev
added light sensor to config, removed pcontroller
works to take distance measures from both wall
next work on line reader
implemented line reader need further test