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.
Everything should be optional. This includes certificates too. I could merge something that would generate the self-signed certs at boot, when a special environment variable is present (for example `WILDFLY_SELF_SIGNED_CERTIFICATES`). This would mean that something like the [`launch.sh`](https://github.com/goldmann/eap-dockerfiles/blob/simple/eap/launch.sh) should be created and this could handle the certs generation. I would suggest sending a PR for WildFly and we could then create similar setup for AS7.

The `launch.sh` script would be used as `CMD`.