Drop Fig in favour of Docker Compose

According to Fig documentaion the project is no longer maintained and Docker Compose should be used as replacement.
This commit updates both the YAML configuration and documentation accordingly.

Author: Búza Géza

README.md

@@ -20,7 +20,7 @@ PHPStack gives you everything you need for developing PHP applications locally.
 ### Requirements
 
 * [Docker](https://docker.com/)
-* [Fig](http://orchardup.github.io/fig/)
+* [Docker Compose](http://docs.docker.com/compose/)
 * [Vagrant](http://www.vagrantup.com/) (optional)
 * [VirtualBox](https://www.virtualbox.org/) (optional)
 
@@ -35,12 +35,14 @@ $ cd phpstack
 $ vagrant up
 
 # Boot up the Docker containers
-$ fig up
+$ sudo docker-compose up
 ```
 
-> If you're using the CoreOS box, make sure to set your `DOCKER_HOST` so Fig knows where to boot up the Docker containers.
+> If you're using the CoreOS box, make sure to set your `DOCKER_HOST` so Docker Compose knows where to boot up the Docker containers.
 
-Once everything is up and running, you can access Shipyard at `http://<ip>:8080`. The default user credentials are `admin:shipyard`. Once logged in, you will need to add an engine with an address of `http://<ip>:2375` to see the local containers.
+Once everything is up and running, you can access Shipyard at `http://<IP>:8080`. When Docker starts, it creates a virtual interface named *docker0* on the host machine. The referenced IP will be the address of that interface.  It can be obtained by running the command `ip addr show dev docker0`.
+
+The default user credentials are `admin:shipyard`. Once logged in, you will need to [add an engine](http://shipyard-project.com/docs/engines/) with an address of `http://<IP>:2375` to see the local containers.
 
 The IP is in both cases either `127.0.0.1` or your Vagrant IP (`192.168.33.10` by default).