增加两个便捷的
public void resetContent(Reader reader) {
		this.offe = 0;
		this.br = new AnsjReader(reader);
	}
	
	public void resetContent(Reader reader,int buffer) {
		this.offe = 0;
		this.br = new AnsjReader(reader,buffer);
	}
顺便兼容以前1.x时代的api