add 2 lines between top level definitions

contracts/test-helpers/BasicTokenMock.sol

@@ -1,6 +1,9 @@
 pragma solidity ^0.4.4;
+
+
 import '../token/BasicToken.sol';
 
+
 // mock class using BasicToken
 contract BasicTokenMock is BasicToken {
 

contracts/test-helpers/LimitBalanceMock.sol

@@ -1,6 +1,9 @@
 pragma solidity ^0.4.4;
+
+
 import '../LimitBalance.sol';
 
+
 // mock class using LimitBalance
 contract LimitBalanceMock is LimitBalance(1000) {
 

contracts/test-helpers/PullPaymentMock.sol

@@ -1,6 +1,9 @@
 pragma solidity ^0.4.4;
+
+
 import '../PullPayment.sol';
 
+
 // mock class using PullPayment
 contract PullPaymentMock is PullPayment {
 

contracts/test-helpers/SafeMathMock.sol

@@ -1,6 +1,9 @@
 pragma solidity ^0.4.4;
+
+
 import '../SafeMath.sol';
 
+
 contract SafeMathMock is SafeMath {
   uint public result;
 

contracts/test-helpers/StandardTokenMock.sol

@@ -1,6 +1,9 @@
 pragma solidity ^0.4.4;
+
+
 import '../token/StandardToken.sol';
 
+
 // mock class using StandardToken
 contract StandardTokenMock is StandardToken {
 

contracts/test-helpers/StoppableMock.sol

@@ -1,6 +1,9 @@
 pragma solidity ^0.4.4;
+
+
 import '../Stoppable.sol';
 
+
 // mock class using Stoppable
 contract StoppableMock is Stoppable {
   bool public drasticMeasureTaken;