Add Red Gate's logo to the project.
Add Red Gate's logo to the site.

Add the logo to the side bar and to the Sponsors' page. Red Gate
requested we link to the specific short URL included here, so please
don't use the usual/full Red Gate URL.
Merge branch 'red-gate-logo' of git://github.com/alastairs/DDDEastAnglia into alastairs-red-gate-logo

Add Red Gate's logo

Conflicts:
	DDDEastAnglia/Views/Home/Sponsors.cshtml
	DDDEastAnglia/Views/Shared/_Layout.cshtml
Merge branch 'alastairs-red-gate-logo' into staging