Adds support to SSL on Wildfly

To try this image follow the build instructions or just run:

`docker run -it -p 8080:8080 -p 8443:8443 abstractj/wildfly:jboss`

Or just run:

`docker build -t jboss/wildfly .`

The readme instructions were updated, also.
@goldmann to me wasn't'a big concern because they can easily replace it. Another possible alternative is to add it to the ENTRYPOINT or CMD instructions, to generate it during the startup time. Wdyt?