Sign notification adjustment.

No notifications when sign contains only spaces.  Indentation of sign
content.

src/me/ryanhamshire/GriefPrevention/BlockEventHandler.java

@@ -104,7 +104,8 @@ public class BlockEventHandler implements Listener
 		boolean notEmpty = false;
 		for(int i = 0; i < event.getLines().length; i++)
 		{
-			if(event.getLine(i).length() != 0) notEmpty = true;
+			String withoutSpaces = event.getLine(i).replace(" ", ""); 
+		    if(!withoutSpaces.isEmpty()) notEmpty = true;
 			lines.append("\n  " + event.getLine(i));
 		}