deb files and apt repository from maven build

This pull request is related to Issue #641
The maven build will create an apt repository in the distribution/target/apt-repo directory.
You can use it from your CI like this:
echo "deb https://buildhive.cloudbees.com/job/theoweiss/job/openhab/ws/distribution/target/apt-repo/ /" > /etc/apt/sources.list.d/openhab-cloudbees.list
apt-get update
apt-cache search openhab
apt-get install openhab-addon-binding-tinkerforge