Add global allow guest access setting and per user toggles

data/interfaces/default/settings.html

@@ -520,6 +520,16 @@ available_notification_agents = sorted(notifiers.available_notification_agents()
                                data-parsley-errors-container="#http_hash_password_error" data-parsley-error-message="Cannot un-hash password, please set a new password." data-parsley-no-focus required>
 
 
+                        <div class="padded-header">
+                            <h3>Guest Access</h3>
+                        </div>
+                        <div class="checkbox">
+                            <label>
+                                <input type="checkbox" id="allow_guest_access" name="allow_guest_access" value="1" ${config['allow_guest_access']}> Allow Guest Access to PlexPy
+                            </label>
+                            <p class="help-block">Allow shared users to login to PlexPy using their Plex.tv account.</p>
+                        </div>
+
                         <div class="padded-header">
                             <h3>API</h3>
                         </div>