Implement database access for user information

templates/idp/login.gohtml

@@ -1,6 +1,7 @@
 {{ define "content" }}
     <form method="post">
         {{ .csrfField }}
+        {{ if .errors.Form}}<p>{{ .errors.Form }}</p>{{ end }}
         {{ if .errors.Email }}<p>{{ .errors.Email }}</p>{{ end }}
         <label for="email">{{ .LabelEmail }}</label>
         <input type="text" id="email" name="email" value="{{ .Email }}"/><br/>