(cikl/cikl#56) Fix worker install

- Disable 'development' group when doing the bundle install. This
  effectively removes the requirement for nokogiri to be installed by
  removing our dependency on Jeweler. We don't need to perform jeweler
  tasks from within the VM.
Notify service if bundle installs anything

- This ensures that the service is restarted if any of the dependencies
  change.
Fix name of service
Merge pull request #58 from justfalter/fix_worker_install

Fix worker install