Start working on Pathfinder
Add Pathfinder.getNeighbours
Add Pathfinder.computeCostofTravel

Update computeCostOfTravel
Add Pathfinder.getCityWithLowestF
Add some helpful functions
Add Pathfinder utilities
Update Pathlink

Update PathLink
Add Pathfinder.findPath

Update Pathfinder.findPath
Add Pathfinder.getPath
Remove show functions
Clean up
Add City.equals
Add Worker.validatePath
Add wrappers for Pathfinder.findPath
Update City
Remove Worker.findPath and Worker.nextCity
DEBUG PATHFINDER
Smal changes in pathfinding
Important FIX
Update City