Add vagrant file and instructions for spinning up new VM instance;
Also, use index.php instead of bootstrap.php since nginx likes that better.

See: #0004
Serve 404 page from Slim even when url dosen't end in .php.
See: #0004
use public url for the source of the virtual machine;
See: #0004
Merge pull request #5 from des4maisons/task-0004-add-vagrantfile

Task 0004 add vagrantfile