Added SAML2 support (#185)

* ~ in gitignore

* add config options for SAML authentication

* add information about SP metadata

* add gem for omniauth-saml

* Add the SAML strategy as a middleware

* add gem for omniauth-saml

* Send SAML request to saml module

* Pass env parameters to saml provider

* Add options for specifying saml signing certificate

* Almost there

* Re-enable SAML redirection

* Correctly map saml attributes

* change full certificate to only the fingerprint

* change full certificate to only the fingerprint

* revert changes to gitgnore

* cleanup

app/controllers/sessions_controller.rb

@@ -23,6 +23,10 @@ class SessionsController < ApplicationController
     if Rails.application.config.omniauth_ldap
       redirect_to "#{relative_root}/auth/ldap"
     end
+    #If SAML is enabled, just route to it instead.
+    if Rails.application.config.omniauth_saml
+      redirect_to "#{relative_root}/auth/saml"
+    end
   end
 
   def create