Update to latest version of all dependencies

[eira-fransham]

This change is 

[kvark]

Nice, thank you!

[kvark]

Code needs to be fixed, like CI errors indicate

[jameshiew]

This branch compiles for me now locally, maybe the Travis build could be attempted again?

[kvark]

bors r+

[bors]

Build failed:

• continuous-integration/travis-ci/push

[kvark]

Errors still see legitimate?

14 | use genmesh::generators::{IndexedPolygon, SharedVertex, SphereUV};

   |                                                         ^^^^^^^^

   |                                                         |

   |                                                         no `SphereUV` in `generators`

   |                                                         help: a similar name exists in the module (notice the capitalization): `SphereUv`

[eadf]

@Vurich I have rebased your changes and fixed the last build errors here
Please take what you need to make this PR going.

The main issue was cgmath::Point3::from(mint::Vector), for some reason From/Into didn't want to co-operate. So I settled for a less effective: Point3::from(*v.pos.as_ref()), but at least It runs.

I will keep rebasing that branch for a while, keeping it updated with master