Merge pull request #574 from gakonst/master

Fix unused variable warning in `Standard Token.sol`

contracts/token/StandardToken.sol

@@ -57,7 +57,7 @@ contract StandardToken is ERC20, BasicToken {
    * @param _spender address The address which will spend the funds.
    * @return A uint256 specifying the amount of tokens still available for the spender.
    */
-  function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
+  function allowance(address _owner, address _spender) public constant returns (uint256) {
     return allowed[_owner][_spender];
   }
 
@@ -67,13 +67,13 @@ contract StandardToken is ERC20, BasicToken {
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    */
-  function increaseApproval (address _spender, uint _addedValue) public returns (bool success) {
+  function increaseApproval (address _spender, uint _addedValue) public returns (bool) {
     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) public returns (bool success) {
+  function decreaseApproval (address _spender, uint _subtractedValue) public returns (bool) {
     uint oldValue = allowed[msg.sender][_spender];
     if (_subtractedValue > oldValue) {
       allowed[msg.sender][_spender] = 0;