Build failed messaging should print to stderr

[pushred]

If there is a failure when building a project during deploy I've noticed what seems to be a new feature, or at least log output:

Build failed, reverting project.

The problem is I don't think this is printed to stderr, so in my case at least a CI build within which the deploy is running doesn't know that the deploy actually failed (on some level). So unless someone reviews the log output carefully the build otherwise appears to have been successful.

[Zertz]

This is quite an annoyance because not only CI passes, but the project deployed notification is also being sent.