Merge pull request #23 from bvssvni/master

Added metadata to Cargo.toml, renamed package
Merge pull request #24 from bvssvni/master

Going back to deprecated `pixels_mut`
Merge pull request #26 from bvssvni/master

Manually replacing pixels
Upgraded to latest Rust

* Replaced “tags” with “keywords” in Cargo.toml
* Added missing Copy implementations