Add tests for the std files.

std/StandardToken.sol

@@ -1,3 +1,5 @@
+pragma solidity ^0.4.0;
+
 import "./Token.sol";
 
 contract StandardToken is Token {

std/Token.sol

@@ -1,3 +1,5 @@
+pragma solidity ^0.4.0;
+
 contract Token {
 	event Transfer(address indexed _from, address indexed _to, uint256 _value);
 	event Approval(address indexed _owner, address indexed _spender, uint256 _value);

std/mortal.sol

@@ -1,3 +1,5 @@
+pragma solidity ^0.4.0;
+
 import "./owned.sol";
 
 contract mortal is owned {

std/owned.sol

@@ -1,3 +1,5 @@
+pragma solidity ^0.4.0;
+
 contract owned {
     address owner;
 

std/std.sol

@@ -1,3 +1,5 @@
+pragma solidity ^0.4.0;
+
 import "./owned.sol";
 import "./mortal.sol";
 import "./Token.sol";