Owned.sol to include transferOwnership

[hav-noms]

Right now ownership transfers is a 2 step process

1. nominateNewOwner
2. acceptOwnership

Proposing to add not replace the functionality for transferOwnership(address _newOwner) which without nomination or acceptance will transfer the ownership direct to the given address.
This will speed up protocol upgrades when the automated scripts and potentially the delegated migrated can just assign the ownership without the 2 step process.

[jjgonecrypto]

One advantage of the two step process is preventing any mistakes in the nomination - if the address is mistyped in a transferOwnership call then ownership is lost forever.