Add Facebook logout endpoint
 - expires the user's current session
 - redirects to facebook logout URL with access token and App URL
Encode parameters
Change 200 to 400 when session/identity not found
 - add "WARN" logging when either occurs
return a 204 response with fbLogoutUrl as a header
add postLogout method
java, really.. URL.toString doesn't do what it should.
 - java -1
 - java :-1:
need to specify in web.xml the header to be exposed cross origin
javadoc & unused header param
After updating facebook settings, the afterLogout endpoint is not needed
error in doc
Merge pull request #245 from CruGlobal/facebook-logout

Facebook logout