Create License.md

This software is now licensed under GPL v3.
Added libraries to source
finished 'butcher' class, imports optimization and minor code cleanup
Started developing 'ChestEngine' and fixed some style.
Removed .Idea directory
Merge branch 'dev'
Update BlockListener.java

Removed some redundant stuff
Added command listener
Commandlistener and Util updates
Small tweaks
removed ide files
Lots of optimisations
CommandListener & Util updates
CommandListener & Util updates
Merge pull request #2 from Spacyyeti/master

bring dev up-to-date