Burst Browser Cache for Static Assets

Required a new minor version of Chaos which allows downstream projects (incl. this one) to override a value to set the cache control header for resources.

Here's an example of the new cache-control header in action:

```
GET /js/dist/main.js HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate, compress
Host: localhost:8080
User-Agent: HTTPie/0.7.2

HTTP/1.1 200 OK
Cache-Control: max-age=0, must-revalidate
Content-Length: 224098
Content-Type: application/x-javascript
Last-Modified: Wed, 29 Jan 2014 16:00:30 GMT
Server: Jetty(8.y.z-SNAPSHOT)
```