Adding XING and Foursquare Providers
- The login action redirects the user to the app if he is already authenticated now
updated changelog
fixed too many redirects error
Update docs/src/manual/source/index.html.erb

Added Woisio.com to Who uses SecureSocial List.
- Added an event API that can be used to track events(only login/logout yet). Scala only for now.
Merge pull request #136 from kdrdgn/master

Who uses SecureSocial List
Merge branch 'refs/heads/xing-provider'

Conflicts:
	samples/scala/demo/conf/play.plugins
adding XING and Foursquare Providers