[sugar] Joyride is reopened for development.

[Michael Stone]

The initial round of faster work has been pushed; look for joyride
builds containing rainbow-0.7.11 or later. As always, patches are
welcome. Thanks to Tomeu for this one.

(Incidentally, this rainbow release also supports setting rlimits on
activities via a "permissions.info" file. I'll try to write up some
examples as my time permits, but don't wait for me if you want to play!)

Michael