Run Rustfmt on entire repo

.travis.yml

benches/mod.rs

src/cloudabi.rs

src/dummy.rs

src/error.rs

src/error_impls.rs

src/freebsd.rs

src/fuchsia.rs

src/lib.rs

src/linux_android.rs

src/macos.rs

src/openbsd_bitrig.rs

src/rdrand.rs

src/solaris_illumos.rs

src/use_file.rs

src/wasi.rs

src/wasm32_bindgen.rs

src/wasm32_stdweb.rs

src/windows.rs

tests/mod.rs