If any worker returns an error, main should exit non-zero

[aztechian]

As a user of Bridger, when running in a CI server environment I would like to fail my pipeline if any of the workers types return an error status. This will allow me to stop my pipeline and be aware that some files I expect to be present are not.

This may filter down to the individual workers as well, as most of them probably print the error, but swallow the object and keep trying to get as much as they can.

[aztechian]

Additionally, we should add a command line flag to ignore failures, and just return 0 regardless