~dave-cheney/juju-core/110-remove-instance-newaddresses : changes

From Revision 2523

Rev		Summary	Authors	Date	Diff	Files
47		Initial attempt at a juju command-line tool Initial attempt at a juju command-line tool Features worthy of comment: * Partly inspired by $GOROOT/src/cmd/go, but eschews IMO-nasty globals in favour of testability. * Uses rog's gnuflag package because it's convenient and correct and no harder than using the builtin flag package. * I don't like the way we have 2 code paths that handle errors and usage- printing, but since flag insists on using stderr (and gnuflag rightly preserves this behaviour) I think it's necessary. * `go build -o juju` inside cmd/juju should produce a binary you can play around with; this is probably the best way to actually explore how it works and whether it's functionally acceptable (as opposed to stylistically, technically, etc). * Includes a not-really-functional implementation of juju.Conn, which I can't actually use (or test effectively) until we have environ types (including "dummy") registered globally; but alows me to demonstrate how I vaguely intend a Command should work. R=rog, niemeyer CC= https://codereview.appspot.com/5554075	William Reade	12 years ago