Consider a nicer package name?

[gustafla]

I think the current name rust-rocket is both too overloaded (conflicting with the rocket web framework), and it has the rust- prefix which looks bad in my opinion. I propose we consider republishing the create (and renaming this repo) something else. rocket-sync is already taken, but how about demo-rocket or sync-tracker-rocket? Ideally I would prefer an even shorter name, but we need to make sure the users know it's a compatible implementation of the rocket client.