Upload RoboJam jams

[cpmpercussion]

It would be cool to be able to save a "good" robojam reply, or have robojam make such replies automatically every now and then.

-- Does robojam have a user name? A CloudKit user? can I just make one manually?

[cpmpercussion]

I think this issue is a bit of a priority for the next version - the robojam concept needs to be refined so that it's a bit more useful.