0.4.0: minor enhancement (#2)

* start refactoring

* add labels for server name and type + firmware version

* Compatibility with older iLO versions (#2)

* Compatibility with older iLO versions

* Update README repository info

* Changed default port to 9100

* Changed default port to the one registered at https://github.com/prometheus/prometheus/wiki/Default-port-allocations
Updated README with metics output from older iLO devices