Allow use as a Maven dependency. Upgrade to NuVotifier.

[PikaMug]

This PR will allow developers to use PhatLoots as a Maven dependency through JitPack. I have tested that it works, as I'm currently using the master fork of my repo to compile one of my plugins.

Upgrading to NuVotifier was necessary because the last passing build of Votifier on Jitpack was compiled against Bukkit 1.2.5, which is no longer available for download. NuVotifier is a true drop-in replacement for Votifier by some of the original authors.

Compilation instructions added to README