Replacing nginx with a more flexible nginx role.

See: https://galaxy.ansibleworks.com/list#/roles/2
Adding documentation for configuring multiple applications
Update Vagrantfile

This fixes an issue where ansible blows up on initial provision. 

__Sample error this resolves: __
ERROR: provided hosts list is empty
Ansible failed to complete successfully. Any error output should be
visible above. Please fix these errors and try again.
Merge pull request #7 from alairock/patch-1

Update Vagrantfile
Merge pull request #4 from FriendsOfCake/multiple-sites

Replacing nginx with a more flexible nginx role.