Update Batman Website

I've tried to pull together the brochure update we did into something shippable. It would be great if you guys could run this `jekyll serve`, dig around and let me know what you think. I need to finish some links on the downloads page but am blocked by the need to launch Batman 0.15, my large update to batman-rails and some work to provide a simple ruby web server to serve a batman project.

I've removed some examples because they were out of date and not maintained, and added lots of external links. Please suggest any additional links you know of.

@nickjs @hornairs @kristianpd @jamesmacaulay 
/cc @benwatts @Healthcare 

![screen shot 2013-05-28 at 10 52 47 pm](https://f.cloud.github.com/assets/819476/577107/9b54f684-c824-11e2-9fbe-b02c41c455c8.png)

![screen shot 2013-05-28 at 10 53 02 pm](https://f.cloud.github.com/assets/819476/577109/9eb059a4-c824-11e2-88f6-d5cf9b126b9c.png)

![screen shot 2013-05-28 at 10 53 12 pm](https://f.cloud.github.com/assets/819476/577110/a1083320-c824-11e2-9ac1-4a33af2eca6f.png)