added docs for facebook configuration
added button template withous inline css and button invocation function
added return to referrer page for auth plugin
added missing function/page for visitor settings
spasing changes
version update
update template variable defaults
refactored logic for extra openid params
Revert "update template variable defaults"

This reverts commit 1e07d75c5647270e6d6a5dec9f21cf2da9133511.
update template variable defaults
Merge pull request #1463 from jadwigo/master

authenticate referrer, facebook etc.