prepare pom.xml file for deployment into the JBoss Nexus

This pull-request is about making db_bootstrap ready to be deployed as artifacts in the JBoss Nexus repository. To be allowed to publish artifacts under the "org.wildfly.extras" you will have follow some guidelines https://developer.jboss.org/wiki/WildflyExtrasRepository
Hey Harms. We really need a tool inside wildfly's bin folder that is able to download, register, and configure an extension! 

It is not the responsibility of this project (db-bootstrap). But an excellent example of something that wildfly should be able to support. As an example one could imagine stuff like this:
${wildfly.home}/bin/modules.sh --list  --- shows public modules from the extras ecosystem
${wildfly.home}/bin/modules.sh --add org.wildfly.extras:my-artifact:1.0 -- installs the my-artifact JBoss module
... etc etc. 

This is a must have :)