Add caustics/GI to potential feature list on readme
Add heptoroid scene.
Make CubeMap face image coordinates human-sensible.
Add tachikoma scene, placeholder bunny skyboxe.
Add tachikoma scene to scene list.
Update assets submodule.
More configurable animator.
Progress bar shows time taken on completion.
Better progress bar formatting.
Better error message for missing model file.
Update assets submodule (was missing models)
Move code into /src and add Cargo support.
Reset scene config to test scene.
Add Travis
(1/2) Rename cargo.toml
Rename cargo.toml to Cargo.toml
Add build status image to readme.
Travis runs tests instead.
Optimise BBox::intersects

perf record shows BBox::intersects taking up most CPU time on the
heptoroid scene. See comment in BBox::intersects for more details.
Fix broken fresnel, add heptoroid-refractive.