Update remaining contract Solidity versions to 0.5.5

contracts/erc721/compiler.json

@@ -5,7 +5,16 @@
     "isOfflineMode": false,
     "compilerSettings": {
         "evmVersion": "byzantium",
-        "optimizer": { "enabled": true, "runs": 1000000 },
+        "optimizer": {
+            "enabled": true,
+            "runs": 1000000,
+            "details": {
+                "yul": true,
+                "deduplicate": true,
+                "cse": true,
+                "constantOptimizer": true
+            }
+        },
         "outputSelection": {
             "*": {
                 "*": [

contracts/erc721/contracts/src/ERC721Token.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.24;
+pragma solidity ^0.5.5;
 
 import "./interfaces/IERC721Token.sol";
 import "./interfaces/IERC721Receiver.sol";
@@ -59,7 +59,7 @@ contract ERC721Token is
         address _from,
         address _to,
         uint256 _tokenId,
-        bytes _data
+        bytes calldata _data
     )
         external
     {

contracts/erc721/contracts/src/MintableERC721Token.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.24;
+pragma solidity ^0.5.5;
 
 import "./ERC721Token.sol";
 

contracts/erc721/contracts/src/interfaces/IERC721Receiver.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.24;
+pragma solidity ^0.5.5;
 
 
 contract IERC721Receiver {
@@ -37,7 +37,7 @@ contract IERC721Receiver {
         address _operator,
         address _from,
         uint256 _tokenId,
-        bytes _data
+        bytes calldata _data
     )
         external
         returns (bytes4);

contracts/erc721/contracts/src/interfaces/IERC721Token.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.24;
+pragma solidity ^0.5.5;
 
 
 contract IERC721Token {
@@ -66,7 +66,7 @@ contract IERC721Token {
         address _from,
         address _to,
         uint256 _tokenId,
-        bytes _data
+        bytes calldata _data
     )
         external;
 

contracts/erc721/contracts/test/DummyERC721Receiver.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity 0.4.24;
+pragma solidity ^0.5.5;
 
 import "../src/interfaces/IERC721Receiver.sol";
 
@@ -51,7 +51,7 @@ contract DummyERC721Receiver is
         address _operator,
         address _from,
         uint256 _tokenId,
-        bytes _data
+        bytes calldata _data
     )
         external
         returns (bytes4)

contracts/erc721/contracts/test/DummyERC721Token.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity 0.4.24;
+pragma solidity ^0.5.5;
 
 import "../src/MintableERC721Token.sol";
 import "@0x/contracts-utils/contracts/src/Ownable.sol";
@@ -31,8 +31,8 @@ contract DummyERC721Token is
     string public symbol;
 
     constructor (
-        string _name,
-        string _symbol
+        string memory _name,
+        string memory _symbol
     )
         public
     {

contracts/erc721/contracts/test/InvalidERC721Receiver.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity 0.4.24;
+pragma solidity ^0.5.5;
 
 import "../src/interfaces/IERC721Receiver.sol";
 
@@ -50,7 +50,7 @@ contract InvalidERC721Receiver is
         address _operator,
         address _from,
         uint256 _tokenId,
-        bytes _data
+        bytes calldata _data
     )
         external
         returns (bytes4)

contracts/erc721/package.json

@@ -68,7 +68,7 @@
     },
     "dependencies": {
         "@0x/base-contract": "^5.0.2",
-        "@0x/contracts-utils": "2.0.1",
+        "@0x/contracts-utils": "^2.0.8",
         "@0x/types": "^2.1.1",
         "@0x/typescript-typings": "^4.1.0",
         "@0x/utils": "^4.2.2",