Added Sample Configuration for Atlassian Crowd
Added Crowd Omniauth Provider
Added omniauth_crowd to Gemlock
Added crowd to the list of default providersi and enabled_social_providers
Added images taken from Atlassian's website which have been cropped and resized
http://www.atlassian.com/dms/wac/images/press/Atlassian-logos/logoCrowdPNG.png