Dev environment with Docker+Fig

From a fresh repo

````
$ npm install
$ fig up
Attaching to uptime_mongo_1, uptime_uptime_1s
....
mongo_1  | 2014-11-07T18:18:27.689+0000 [initandlisten] waiting for connections on port 27017
....
uptime_1 | Express server listening on host localhost, port 8082 in development mode
```

And you have a nice dev environment with Uptime running trough nodemon in a container linked to a mongodb container.