Stack builder doesn't log enough

[carymrobbins]

~~It seems the building with Stack doesn't stream output to the messages window, so you have to wait until the build completes before you can see any output. The Stack builder should be improved to stream the output properly to the messages window.~~

Actually, it seems to stream just fine. The real problem is that if it has to download a lot of dependencies, it seems these messages are filtered out so the user is waiting a long time to get feedback. Ideally, we could just print any info it provides so the user knows what's going on.