添加一个静态HashMap的回调配置,让view能配置独立的回调.或者使用默认的全局回调

使用方法:
FinalBitmap fb = FinalBitmap.create(ctx);
FinalBitmap.addLoadBitmapCallBack(imgView.getId(), new Displayer(){
    @Override
    public void loadCompletedisplay(View imageView, Bitmap bitmap, BitmapDisplayConfig config) {
        // TODO Auto-generated method stub			
    }
    @Override
    public void loadFailDisplay(View imageView, Bitmap bitmap) {
        // TODO Auto-generated method stub
    }
});
fb.display(imgView,...)