Add Oceania Countries

Another continent!

I figured out how to (mostly) center the region, but the zoom logic still seems to be incorrect. There are a ton of really tiny islands. I can try to remove them, but it might be easier just to hard-code the zoom differently.

![screen shot 2013-11-28 at 1 09 44 pm](https://f.cloud.github.com/assets/173440/1641733/b48f84b2-5860-11e3-8ac0-463e5da100cf.png)