Fix for bigger payloads

as suggested by izqui in case a function calls transfer under the hood

contracts/token/BasicToken.sol

@@ -17,7 +17,7 @@ contract BasicToken is ERC20Basic, SafeMath {
  * Fix for the ERC20 short address attack  
  */
   modifier onlyPayloadSize(uint size) {
-     assert(msg.data.length == size + 4);
+     assert(msg.data.length >= size + 4);
      _;
   }