Changes to the logo and style of the HowTo to follow EY/Cloud brand.

I've changed the logo and added the Cloud background hue to remove the Orchestra branding from this page.

![Screen Shot 2013-04-09 at 15 45 11](https://f.cloud.github.com/assets/686194/357330/4d456c9c-a125-11e2-85de-9b2a7fda69e4.png)

**Note:** The text content will probably need to be revised as well, there are references and links to the Orchestra.io GitHub page and documentation.