Executable names are weird

[LPGhatguy]

If you install Rojo via Foreman...

[tools]
rojo = { source = "rojo-rbx/rojo", version = "0.6.0-alpha.1" }

and then run rojo --help, you'll see that Rojo knows that its executable name is weird:

Rustup solves this by keeping the executable names the same, but putting them into subfolders. We should adopt that strategy, too!