Htaccess: Fixed breaking 500 error for apache2.4 due to FilterProvider...

... change.  Also appears to work still for apache 2.2, thanks to h5bp.

Cherry-picked from:
https://github.com/h5bp/html5-boilerplate/blob/dac15682b35ad69f519205e1b82694d0cab189ca/.htaccess
and this issue:
https://github.com/h5bp/html5-boilerplate/issues/1012

Of course, it might make just as much sense to fully pull over the latest .htaccess file from h5bp with a little deployment testing.  *shrugs*