类似一些游戏爆炸动画效果，源码letterpressexplosion，类似知名iOS拼字游戏Letterpress的爆炸动画，点击方块会有烟花爆破的动画效果，这个效果比较适合一些游戏的效果的。
测试环境：Xcode 5.0，iOS 4.3以上
Letterpress-like explosion.
Category on UIView called Explode that will take the uiview and explode it into pieces.
[myView lp_explode];
Not exactly the same as letterpress but will point people to the right direction.
