仿Path按钮动画效果 a button animation layout like Path
2.0 感谢 @若奇 的修改，不过基本上我又在他的基础上重写了动画那一部分
change：
1.优化动画效果
2.更改动画系统（使用了NineOldAndroids的动画框架）
3.重写了类结构，增加动画方向选择（@若奇）
其中使用了NineOldAndroids 框架，thanks
由于动画效果的限制，会导致Android3.0以下版本不能接受到单击事件，需要在动画结束的时候重新设置LayoutParams才行
虽然那些按钮弹出去了，但是实际位置还是在旋转按钮的下面，把旋转按钮改小点，不能覆盖底下的按钮的时候，就发现底下按钮的onCLick事件会有响应。推测nineoldandroids框架只是仿制出了3.0之后的属性动画效果，但是本质还是跟2.x的补间动画一样。属性动画的view在播放完动画后，view停在哪就是哪，补间动画的view虽然看上去在那，但是实际的位置还是在原来起始的地方。属性动画是要View.java这个类本身的支持，2.x的View.java不支持，也就达不到属性动画的效果。
东西都少了，还好意思扔上来，可耻
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