Clean up the doc and update for newer versions of Docker for Mac (#85)

Author: Michael Johnsey

documentation/with_docker.md

@@ -1,18 +1,27 @@
 # Developing Using Docker
+
 ## Install Docker
+
 Follow the apporpriate installation guide provided by [Docker](https://docs.docker.com/installation/#installation) to get setup.
 
-## Run a Sculpin contain
-From the checked out repo
+## Run a Sculpin container
+
+From the checked out repo:
+
 ```sh
-docker run -d -p 8000:8000 -v "$PWD:/data" clue/sculpin generate --watch --server
+#!/usr/bin/env sh
+docker run -it --rm -p 8000:8000 -v "$(pwd)":/data -u $(id -u) clue/sculpin generate --watch --server
 ```
 
 ## View changes in action
 
 Browse to your running docker container.
 
 - Linux: [http://localhost:8000](http://localhost:8000)
-- Mac: prbably [http://192.168.59.103:8000](http://192.168.59.103:8000)
+- Mac
+  - Newer versions of Docker will work the same as Linux: [http://localhost:8000](http://localhost:8000)
+  - Older version of Docker for Mac will have its own IP on your machine, default is: [http://192.168.99.100:8000](http://192.168.99.100:8000)
+    - If that does not work, open from the command line run the following command:
+    `open "http://$(docker-machine ip):8000"`
 
 There, you did it!  Congratulations.