Removed laneindex from lane
Major Changes to Lane

All classes inherit from one of two types
AvoidTarget - targets that kill on contact
SeekTarget - targets that are safe but require frog is over them
Changed Frog class to inherit from BoundedObject

algo class is no more.
Updated Frogger to play nice with recent changes to Frog and Lane

Removed GlobalMethods and laneToY
Removed concept of lane index from lane and target