Merge pull request #1 from yutianqiuhao/master

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GIF belongtoArray;
Delete some unnecessary files;
Mofify some code;
Add the function to switch front and back camera
Fix some bug in front camera mode;
Add function of taking photo but still have some problems;
How to take a screenshot? shit!
add shake
add shake function to change the animation
add oration change, make POI stay horizon in landscape view