Merge pull request #634 from Coeuvre/master

Added sprite
Fixed duplicate call to get_settings
Merge pull request #635 from bvssvni/master

Fixed duplicate call to get_settings
Upgrade to latest Rust
Merge pull request #636 from bvssvni/master

Upgrade to latest Rust
Fixed comment
Merge pull request #637 from bvssvni/master

Fixed comment
Added `remove_child` and visibility to `Sprite`