Replaced barclamp controller initialzer with before filter

I transfered the service initialize into a before filter. It's a quite
dirty practice to overwrite the controller initializer and the way it is
done now will result in problems while upgrading to rails 3 or 4.
This was missing for the barclamp model.
Merge pull request #1043 from tboerger/feature/model-init-replace

Replaced barclamp controller initialzer with before filter