2D->3D

I wrote a class InvCamera to implement 2D to 3D. I will check it and ask ZhuZhe to make sure the fomula is right.
I also created Basic.cpp to include getRotateAngle because of link error.
"typedef Vector3D[3] Triangle;" is wrong but I don't know how to correct so I just commented it.
I upload the EdgeExtraction that I forgot to upload last time.