Post-Message functionality for review

Hello Teacher. If you agree that this code works to post a message, please accept the pull-request and we will move onto either a) helping the others or b) a new ticket.

Lots of love

Matt & Vince
![lolcat7](https://f.cloud.github.com/assets/1581018/482381/e6978958-b894-11e2-9111-057eb1872cc5.gif)