Cleaned up all the internal rendering, and made it much nicer to use. Now, you can simply tell render that this is an internal call, and it will turn template paths into absolute paths for you. Also, we now inject DEBUG if the user hadn't overridden it.

Also, added `omegaStaticUrl` to the config file; it defaults to `/omega`. This allows you to control the url at which omega serves it's static files. This is injected into templates as `static`, if the user hasn't overridden it.