Fig

Renamed images to be fig compatible and added a Fig configuration

In fig it is not possible to have settings ( like installation_type=composer|tarball ) in a separate file, so everything is placed inside fig.yml.. Fig does support getting configuration values from environment variables, but I opt'ed not to use that

FYI : Containers will not be named the same by Fig vs Vagrant. ( You cannot fully control the naming when using Fig, only in vagrant )
The naming has been under debate for some time : https://github.com/docker/fig/issues/45
However, I created this one that covers our needs : https://github.com/docker/fig/issues/541