This moves raven init into a dedicated file where it's configured on load, we no longer load it on /help, but there's only css there so there wasn't anything that could fail anyway. We will also now fail in the most visible way if the value passed to raven is invalid (as in invalid syntax)
Drop haml templates in favor of underscore. Haml templates are harder to maintain and require extra dependencies, we already have underscore.js included and it provides a fast templating engine. Rewrite all client side templates using it.
Performance with underscore is pretty much the same as with haml (with 10k alerts).
