[WIP] FacitionsTax

I would like to add [FactionsTax](http://www.massivecraft.com/factionstax) functionality to FactionsUUID.
I have based this code of the documentation [here](http://www.massivecraft.com/factionstax), and my usage of the plugin. It requires some additions of code to existing classes in order to support the time formatting.

This PR Fixes Issue #138