Perfecting Rust Packaging - The Plan

I’ve filed issues on everything but the i585 triple, which @eefriedman has concerns about, and CI for building Cargo with its own release of Rust (since @alexcrichton is cool on the idea and it’s a lot of work for marginal gain).

@gus What do you think of @eefriendman’s concerns that encoding the i586-ness of the plattform in the target triple is inconsistent with gcc, not the right way to encode CPU features?