APIs for Embedding Nginx-Clojure into a Clojure/Java/Groovy App

This feature makes more easy to debug/test is a prime target.
Some parts of Clojure APIs should be similar to [ring.adapter.jetty](http://ring-clojure.github.io/ring/ring.adapter.jetty.html). e.g.

``` clojure
(run-server handler {:port 8080})
```

It also provides another API which can accept a Nginx configuration file to start up. e.g.

``` java
server.start("/my/nginx.conf");
```
