move binary to src

[vks]

I don't know what the motivation for having the binary in its own directory with its own Cargo.toml is, but I think it makes more sense to just move main.rs to src and delete the other files.

[vks]

Is it possible to specify dependencies for the binary only?

[BurntSushi]

Can you explain a bit more why you think that is? tabwriter-bin has a dependency on both docopt.rs and rustc-serialize. Neither of these dependencies are necessary for this library's core functionality, so I see little reason to impose them on consumers.

[BurntSushi]

Is it possible to specify dependencies for the binary only?

@vks No.

[vks]

Well, then I see why you need two Cargo.tomls, that is unfortunate.

(BTW, tabwriter-bin needs a cargo update to build.)

[vks]

See rust-lang/cargo#1982 for implementing binary-only dependencies in Cargo.

[BurntSushi]

I don't feel any compelling urge to do this. If cargo grows this in the future at some point, we can revisit.