Remove public from interface

http://docs.oracle.com/javase/specs/jls/se7/html/jls-9.html#jls-9.4

src/main/java/org/drtshock/Tuber.java

@@ -1,7 +1,7 @@
 package org.drtshock;
 
 public interface Tuber {
-    public boolean isDelicious();
+    boolean isDelicious();
 
-    public Tuber propagate();
+    Tuber propagate();
 }