Migration to Maven, removing buggy code

In preparation for using sk89q's command framework
Added dependency for sk89q's command framework
formatting
Refactored commands to use sk89q's command lib

plugin main class now more or less follows the singleton pattern
Fixed flags string not recognizing radius flag
dense radius, fix off-by-one in /ds other
pom.xml and project file fixes
fixed guests, egg breeding, other singleton fixes

tbh the guests fixed themselves
Update README.md
Update README.md
fixed sheep and guests going through portals
Merge pull request #4 from Gibstick/DiscoFix2

merge DiscoFix2