Created FramebufferTest for attaching and
rendering to a texture
Update to FluidSim.xcodeproj
Updaed libRigid3D.a
Added stub files for GPU_SmokeSim2D and created
new Xcode target
Renamed files SmokeSime.* -> GpuSmokeSim2D.*
Update to GlfwOpenGLWindow
Put additional methods within try-catch
Exceptions are now written to cerr instead of cout
Updates to GpuSmokeSim2D
Passed test: Render 2D texture to default framebuffer