page--user--login.tpl.php is not recognized
This question is similar to https://stackoverflow.com/questions/8712061/style-drupal-7-log-in-page 

It looks like you need to also have:


a page.tpl.php in your theme for page--anything-else.tpl.php to work
a page--user.tpl.php in your theme


You should also always clear the theme cache after adding/removing template files.