Rubinius metrics meet influxdb II

Hi guys @brixen and @jemc I just took advance of my timezone difference to start the second part of the RBX InfluxDB series, please fell free to ad/remove anything.

Awesome work with docker @jemc  \o/
If I'm not mistaken "Being said that, here is an outline of the whole process" should be "Having said that, here is an outline of the whole process", although I could be wrong.