Added Plugin Support - Fixed Gradle - Bug Fixes in ServerCommandManager
Implemented commands within the console, fixed some major performance issues. Also added the players command which lists all of the online players. CommandSay has been drafted, but not yet ready.
Merge remote-tracking branch 'origin/master' into 1.5.2

Conflicts:
	src/main/java/org/minetweak/Minetweak.java
	src/main/java/org/minetweak/Server.java