polish BasicToken

contracts/token/BasicToken.sol

@@ -11,14 +11,13 @@ contract BasicToken is ERC20Basic, SafeMath {
 
   mapping(address => uint) balances;
 
-  function transfer(address _to, uint _value) returns (bool success) {
+  function transfer(address _to, uint _value) {
     if (balances[msg.sender] < _value) {
       throw;
     } 
     balances[msg.sender] = safeSub(balances[msg.sender], _value);
     balances[_to] = safeAdd(balances[_to], _value);
     Transfer(msg.sender, _to, _value);
-    return true;
   }
 
   function balanceOf(address _owner) constant returns (uint balance) {

contracts/token/ERC20Basic.sol

@@ -4,6 +4,6 @@ pragma solidity ^0.4.4;
 contract ERC20Basic {
   uint public totalSupply;
   function balanceOf(address who) constant returns (uint);
-  function transfer(address to, uint value) returns (bool ok);
+  function transfer(address to, uint value);
   event Transfer(address indexed from, address indexed to, uint value);
 }