Add customized riot web login image

src/freedombone-app-riot

@@ -141,6 +141,16 @@ function riot_download {
         exit 542826
     fi
     cp -r $INSTALL_DIR/${RIOT_FILENAME}/* /var/www/$RIOT_DOMAIN_NAME/htdocs
+
+    # customize the login image
+    if [ -f ~/freedombone/img/logo_riot.png ]; then
+        cp ~/freedombone/img/logo_riot.png /var/www/$RIOT_DOMAIN_NAME/htdocs/img/logo.png
+    else
+        if [ -f /home/$MY_USERNAME/freedombone/img/logo_riot.png ]; then
+            cp /home/$MY_USERNAME/freedombone/img/logo_riot.png /var/www/$RIOT_DOMAIN_NAME/htdocs/img/logo.png
+        fi
+    fi
+
     chown -R www-data:www-data /var/www/$RIOT_DOMAIN_NAME/htdocs
 }