Merge pull request #24 from bvssvni/master

Fixed missing docs warning
Fix breaking changes in rust - drop Zero/One, use Float #25
Merge pull request #26 from PistonDevelopers/25-fix-float-nightly

Fix breaking changes in rust - drop Zero/One, use Float #25
Added link to how to contribute

See PistonDevelopers/piston#715
Use vectors in Camera interface

Using vectors wraps up the relation between the coordinates and makes it also
easier to pass actual vectors as arguments. This is especially tedious when the
vector to pass as argument is a complex expression. The obvious drawback of
this change is, that to use this with individual components one now has to
assemble them into a vector by adding [] first.
Merge pull request #27 from aepsil0n/camera_interface

Use vectors in Camera interface
Upgraded to latest Rust