Using 3D camera from Piston

Closes https://github.com/PistonDevelopers/hematite/issues/67
Merge pull request #68 from bvssvni/cam

Using 3D camera library from Piston
Updated Cargo.lock
Merge pull request #71 from bvssvni/master

Updated Cargo.lock
Port to gfx-rs
Ignore apitrace traces