add 2 lines between top level definitions

contracts/examples/StoppableBid.sol

@@ -1,8 +1,10 @@
 pragma solidity ^0.4.4;
 
+
 import '../PullPayment.sol';
 import '../Stoppable.sol';
 
+
 contract StoppableBid is Stoppable, PullPayment {
   address public highestBidder;
   uint public highestBid;