Small code style change

http://solidity.readthedocs.io/en/develop/style-guide.html#other-recommendations
The visibility modifiers for a function should come before any custom modifiers.

contracts/ownership/Ownable.sol

@@ -35,7 +35,7 @@ contract Ownable {
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
-  function transferOwnership(address newOwner) onlyOwner public {
+  function transferOwnership(address newOwner) public onlyOwner {
     require(newOwner != address(0));
     OwnershipTransferred(owner, newOwner);
     owner = newOwner;