修正了没加载资源前退出程序会出保存异常的问题。增加了配置文件battle.xml用于每关的配置
增加了用xml文件配置每关的npc，奖励，及对应地图
Merge branch 'master' of https://github.com/sorcerer310/Bsugdx002

Conflicts:
	Gdx002/src/com/bsu/gdx002/BsuGame.java
	Gdx002/src/com/bsu/make/MapNpcsFactory.java
修正了读取xml的问题