Request: Overall progress bar?

[kendonB]

Obviously, most projects have targets with very different processing times, but an overall progress bar would still give some useful information, I think.

[krlmlr]

We should definitely provide something like this, but probably not in the short term.

[wlandau-lilly]

Related: ropensci/drake#52. You could probably use past build times to fine tune the progress bar in subsequent builds.