Bugfixes and Enhancements

* Break up large attributes into parts easier to overwrite
* Use easybib_nginx
* Add easybib_nginx attributes and default template features (htpasswd, etc)
* hardcoded nginx group removed
* Most of the "pathnames" were actually files, which should not be created
* Install tcpping and hping only if respective probe is configured
* Use Probes configuration as hashes instead of array so I dont have to specify defaults in stack.json
* Specs