Allow setting the hostname via a -h flag
Allow setting the hostname via a -h flag

This should make it possible to use the app from i.e. inside a (docker) container for easy running...
``` docker run -it --rm -v $(pwd):/app -w /app -p 80:8080 php:7-cli bin/analyze serve --hostname 0.0.0.0 ```
Qafoo/QualityAnalyzer,Qafoo/QualityAnalyzer,Qafoo/QualityAnalyzer,Qafoo/QualityAnalyzer