This pull request fixes the compatibility between Select 2 and Wicket 7. In order to fix the dependencies
I've also made the POMs consistent.
All duplicate information was moved to the parent pom, the description of the parent POM is no longer the same as the Wicket CDI module.
All dependency information is now centralized in the parent POM, including the plugins necessary for building.
I've included the enforcer plugin for consistent POM layout (which is annoying, but helps in the end for enforcing a single style across all project modules).
All plugins now use their most recent version.
Dependencies now use the most recent Java 1.7 compatible version (json has a newer version, but requires java 1.8)
This pull request fixes the compatibility between Select 2 and Wicket 7. In order to fix the dependencies I've also made the POMs consistent.