update constructor syntax for solidity 0.4.23 in numerous contracts (OpenZeppelin#921)

* update solidity-coverage to ^0.5.0

* update truffle dependency to ^4.1.8

* update solium to ^1.1.7

* update all contracts to solidity ^0.4.23

Author: pemulis

contracts/AddressUtils.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 /**

contracts/Bounty.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 import "./payment/PullPayment.sol";

contracts/DayLimit.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 /**
@@ -16,7 +16,7 @@ contract DayLimit {
    * @dev Constructor that sets the passed value as a dailyLimit.
    * @param _limit uint256 to represent the daily limit.
    */
-  function DayLimit(uint256 _limit) public {
+  constructor(uint256 _limit) public {
     dailyLimit = _limit;
     lastDay = today();
   }

contracts/ECRecovery.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 /**

contracts/LimitBalance.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 /**
@@ -15,7 +15,7 @@ contract LimitBalance {
    * @dev Constructor that sets the passed value as a limit.
    * @param _limit uint256 to represent the limit.
    */
-  function LimitBalance(uint256 _limit) public {
+  constructor(uint256 _limit) public {
     limit = _limit;
   }
 

contracts/MerkleProof.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 /*

contracts/ReentrancyGuard.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 
 /**

contracts/access/SignatureBouncer.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ^0.4.23;
 
 import "../ownership/Ownable.sol";
 import "../ownership/rbac/RBAC.sol";

contracts/crowdsale/Crowdsale.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 import "../token/ERC20/ERC20.sol";
 import "../math/SafeMath.sol";
@@ -45,7 +45,7 @@ contract Crowdsale {
    * @param _wallet Address where collected funds will be forwarded to
    * @param _token Address of the token being sold
    */
-  function Crowdsale(uint256 _rate, address _wallet, ERC20 _token) public {
+  constructor(uint256 _rate, address _wallet, ERC20 _token) public {
     require(_rate > 0);
     require(_wallet != address(0));
     require(_token != address(0));

contracts/crowdsale/distribution/FinalizableCrowdsale.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.21;
+pragma solidity ^0.4.23;
 
 import "../../math/SafeMath.sol";
 import "../../ownership/Ownable.sol";