#15 fixed and add config.xml, Config.java

Camera in GamePlay.java is changed to ExtendViewPort which will keep the
current aspect ratio but maximize the shorter direction to try fill the
entire screen, game world will be automatically scaled.
Merge branch 'master' of https://github.com/TigerAce/BomberFight

Conflicts:
	core/src/com/game/bomberfight/screen/GamePlay.java