Fix for faction creation sometimes causing an NPE; hopefully a fix for the cause of the null value as well, from an ID clash in the entity collection of factions

Fix for disband command causing an NPE if run from the console
Additionally, disband command use is now logged

src/com/massivecraft/factions/zcore/persist/EntityCollection.java

@@ -217,8 +217,13 @@ public abstract class EntityCollection<E extends Entity>
 	
 	public String getNextId()
 	{
-		this.nextId += 1;
-		return "" + (nextId - 1);
+		String next = Integer.toString(this.nextId);
+		do
+		{
+			this.nextId += 1;
+		} while ( ! isIdFree(Integer.toString(this.nextId)) );
+
+		return next;
 	}
 	
 	public boolean isIdFree(String id)