Update index_dev.php to work from localhost only

Symfony2 has this check for app_dev.php, so I think will be good to have it also.
feature #11 Update index_dev.php to work from localhost only (diimpp)

This PR was merged into the master branch.

Discussion
----------

Update index_dev.php to work from localhost only

Symfony2 has this check for app_dev.php, so I think will be good to have it also.

Commits
-------

7b8f6ed Update index_dev.php to work from localhost only