Support linux* platforms

[heronyang]

Today, the code only runs on Mac as OpenGL requires different settings if it's running on other platform. So far, we know the followings to the code work on linux* platforms:

• Add GLEW dependency on top of GLUT.
• Use GL/glut.h instead of GLUT/glut.h.

Reference:

• http://cse.poly.edu/cs653/OpenGLCompilationMacLinux8.pdf