Start trying to get a cube synced over network

Yeah, it's in progress. That's why it's in a branch.
Support more OpenGL versions

Use cmr's nice_glfw to get the opengl context instead of setting it up ourselves.
Merge
Add initial networking stuff.
Merge pull request #4 from xales/master

Add initial networking stuff.
Create README.md
Skeletal usage of Cap'n Proto.
Networking stuff.
Fix networking to work as a net.
Check in generated file
Merge pull request #6 from cmr/checkin-capnp

Check in generated file for CapnProto
Fix issue b/c rustc doesn't infer floats from integer constants
Remove dead code
GPLv3