Missing post template

The rails doc says the controller should
`render :template => "saml_idp/idp/saml_post", :layout => false`

The last version of the template I could easily find was back in:
https://github.com/saml-idp/saml_idp/blob/v0.13.0/app/views/saml_idp/idp/saml_post.html.erb

I don't know why they were removed from the gem.