Rename crate name customization option to 'crate' #17
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'package' is a project concept, while 'crate' means artifact. Basically,
all we imported are crates, but they are organized as packages.
Sees tokio-rs/tokio#4613
Sees https://github.com/rust-lang/book/blob/765318b844569a642ceef7bf1adab9639cbf6af3/src/ch07-01-packages-and-crates.md