Sqlite

Amit,

This PR contain an SQLite example. The PHP extension pdo_sqlite should be available in your VM config.

In order to use it, use the following console commands (from http://symfony.com/doc/current/book/doctrine.html):

- `php app/console doctrine:database:create`
- `php app/console doctrine:schema:update --force`

Then you can visit "\db\list".

Let me know if you have some issue.