downgrade to 0.4.17

test_app/app/contracts/another_storage.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.4.17;
 contract AnotherStorage {
   address public simpleStorageAddress;
   address simpleStorageAddress2;

test_app/app/contracts/ownable.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.4.17;
 
 /**
  * @title Ownable

test_app/app/contracts/simple_storage.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.7;
+pragma solidity ^0.4.17;
 
 import "ownable.sol";
 

test_app/app/contracts/test.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.4.17;
 
 library ZAMyLib {
 

test_app/app/contracts/token.sol

@@ -1,6 +1,6 @@
 // https://github.com/nexusdev/erc20/blob/master/contracts/base.sol
 
-pragma solidity ^0.4.2;
+pragma solidity ^0.4.17;
 contract Token {
 
   event Transfer(address indexed from, address indexed to, uint value);