Add cargo-fmt binary
Add cargo-fmt binary

Add a new utility, which formats all readable .rs files in the src
directory of the crate using rustfmt. Both binaries can be installed
using cargo install rustfmt. cargo-fmt can be used as a Cargo
subcommand - cargo fmt.

studoot/rustfmt,graydon/rust,graydon/rust,Emilgardis/rustfmt,studoot/rustfmt,SingingTree/rustfmt,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,rust-lang/rustfmt,aidancully/rust,rust-lang/rustfmt,flutterhash/rustfmt,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,Emilgardis/rustfmt,SingingTree/rustfmt