Keep build container alive in dev mode
Keep build container alive in dev mode

If the CSS or JS doesn't compile in the gulp build process, it
crashes. This has lead to some frustrating problems where I wasn't
sure why my site wasn't updating. For now, I'm just having the
build container re-run if it crashes. Later I'll find a proper
way to make sure gulp responds to this.

shamblesides/rpnow,shamblesides/rpnow