Add logout endpoint for rc_society; close #140

assets/templates/rc_society/dashboard.html.hbs

@@ -29,7 +29,8 @@
   <div class="form-stripe">
     <div class="form-header-right">
       Welcome {{form.display_name}}! |
-      <a href="/">Home</a>
+      <a href="/">Home</a> |
+      <a href="/logout">Sign Out</a>
     </div>
     <h1 class="form-banner">{{form.display_name}} Dashboard</h1>
     {{#if error}}