Moved the following ex-thoughtworkers from the main page

Moved the following ex-thoughtworkers from the main page and onto the alumni site at: http://blogs.thoughtworks.com/alumni/

• Aidan Rogers


• Brian Oxley


• Charles Lowell


• Chris Matts


• Dave Astels


• Jack Bolles


• Matt Clarkson


• Robin Morris


• Steve Freeman


• Tim Bacon


• Tim Velvick


• Wilkes Joiner