Add explicit visibility

contracts/token/StandardToken.sol

@@ -14,7 +14,7 @@ import './ERC20.sol';
  */
 contract StandardToken is ERC20, BasicToken {
 
-  mapping (address => mapping (address => uint256)) allowed;
+  mapping (address => mapping (address => uint256)) internal allowed;
 
 
   /**
@@ -70,15 +70,13 @@ contract StandardToken is ERC20, BasicToken {
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    */
-  function increaseApproval (address _spender, uint _addedValue)
-    returns (bool success) {
+  function increaseApproval (address _spender, uint _addedValue) public returns (bool success) {
     allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
     Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
     return true;
   }
 
-  function decreaseApproval (address _spender, uint _subtractedValue)
-    returns (bool success) {
+  function decreaseApproval (address _spender, uint _subtractedValue) public returns (bool success) {
     uint oldValue = allowed[msg.sender][_spender];
     if (_subtractedValue > oldValue) {
       allowed[msg.sender][_spender] = 0;