Added abstract class Moveable
score class updated
Refactored Moveable, added Monster
pushing hero
Merge branch 'Moveable' of https://github.com/jibin-tomy/survivor_man into Moveable
Fixed a Monster movement bug
Added health related methods
graphics
Merge branch 'Moveable' into ScoreKeeper

Conflicts:
	project.greenfoot
Implemented state pattern
Merge branch 'Moveable' of https://github.com/jibin-tomy/survivor_man into Moveable
Modified Moveable
Hero n score
Merge branch 'Moveable' of https://github.com/jibin-tomy/survivor_man into ScoreKeeper
maze strategy pattern
Hero n score
Merge branch 'Moveable' of https://github.com/jibin-tomy/survivor_man into Moveable
Merge branch 'Moveable' into ScoreKeeper
Fixed exception when Hero dies
Implemented algorithm for 2nd strategy