Update external contracts in compilationTests (to support strict address literals)

test/compilationTests/zeppelin/Bounty.sol

@@ -48,7 +48,7 @@ contract Bounty is PullPayment, Destructible {
    */
   function claim(Target target) {
     address researcher = researchers[target];
-    if (researcher == 0) {
+    if (researcher == address(0)) {
       throw;
     }
     // Check Target contract invariants

test/compilationTests/zeppelin/MultisigWallet.sol

@@ -67,7 +67,7 @@ contract MultisigWallet is Multisig, Shareable, DayLimit {
     }
     // determine our operation hash.
     _r = keccak256(msg.data, block.number);
-    if (!confirm(_r) && txs[_r].to == 0) {
+    if (!confirm(_r) && txs[_r].to == address(0)) {
       txs[_r].to = _to;
       txs[_r].value = _value;
       txs[_r].data = _data;
@@ -81,7 +81,7 @@ contract MultisigWallet is Multisig, Shareable, DayLimit {
    * @param _h The transaction hash to approve.
    */
   function confirm(bytes32 _h) onlymanyowners(_h) returns (bool) {
-    if (txs[_h].to != 0) {
+    if (txs[_h].to != address(0)) {
       if (!txs[_h].to.call.value(txs[_h].value)(txs[_h].data)) {
         throw;
       }

test/compilationTests/zeppelin/crowdsale/Crowdsale.sol

@@ -44,7 +44,7 @@ contract Crowdsale {
     require(_startBlock >= block.number);
     require(_endBlock >= _startBlock);
     require(_rate > 0);
-    require(_wallet != 0x0);
+    require(_wallet != address(0x0));
 
     token = createTokenContract();
     startBlock = _startBlock;
@@ -67,7 +67,7 @@ contract Crowdsale {
 
   // low level token purchase function
   function buyTokens(address beneficiary) payable {
-    require(beneficiary != 0x0);
+    require(beneficiary != address(0x0));
     require(validPurchase());
 
     uint256 weiAmount = msg.value;

test/compilationTests/zeppelin/crowdsale/RefundVault.sol

@@ -23,7 +23,7 @@ contract RefundVault is Ownable {
   event Refunded(address indexed beneficiary, uint256 weiAmount);
 
   function RefundVault(address _wallet) {
-    require(_wallet != 0x0);
+    require(_wallet != address(0x0));
     wallet = _wallet;
     state = State.Active;
   }

test/compilationTests/zeppelin/ownership/Claimable.sol

@@ -35,6 +35,6 @@ contract Claimable is Ownable {
    */
   function claimOwnership() onlyPendingOwner {
     owner = pendingOwner;
-    pendingOwner = 0x0;
+    pendingOwner = address(0x0);
   }
 }

test/compilationTests/zeppelin/ownership/DelayedClaimable.sol

@@ -36,7 +36,7 @@ contract DelayedClaimable is Claimable {
     if ((block.number > end) || (block.number < start))
         throw;
     owner = pendingOwner;
-    pendingOwner = 0x0;
+    pendingOwner = address(0x0);
     end = 0;
   }