Blurrily/server app 46921761

This depends on:

https://github.com/mezis/blurrily/pull/4 and https://github.com/mezis/blurrily/pull/5

What it does:

```
$ bin/blurilly-server -h
Usage: blurrily-server [options]
    -p, --port <PORT>                Bind to PORT, defaults to 12021
    -d, --directory <DIRECTORY>      Work in DIRECTORY, defaults to .
    -b, --bind <ADDRESS>             Bind to ADDRESS, defaults to 0.0.0.0
    -h, --help                       Show this message
```

```
$ bin/blurilly-server
Starting Blurrily Server v0.0.1 in directory: '.' on 0.0.0.0:12021
```