JBoss AS7 docker image

To try this image follow the build instructions or just run:

`docker build -t jboss/as7 .`

and..

`docker run -it -p 8080:8080 -p 8443:8443 jboss/as7`

The readme instructions were updated, also.
Better ides is to run `docker inspect -f '{{ .NetworkSettings.IPAddress }}' IMAGE_ID`.