Refactored GhostMailer's send to current code standards
Refactored GhostMailer's send to current code standards

no issue

- While working on https://github.com/TryGhost/Team/issues/726 have questioned some of the options that were passed along to the `send` method. Documented findings and refactored the code slightly while touching it

janvt/Ghost,TryGhost/Ghost,e10/Ghost,ErisDS/Ghost,ErisDS/Ghost,janvt/Ghost,e10/Ghost,TryGhost/Ghost,TryGhost/Ghost,ErisDS/Ghost