Merge pull request #26 from kobliha/forwarding

Switched to using Service module
New API for get/setting the local forwarder
Using new API for managing local forwarder in UI
Adapted testsuites
Added new RSpec test

- Changed the new API to be testable (Set* returns boolean)
- Used in test and also in dialog while storing values
Tuning RSpec test
Changes file entry a new version
Adapted gitignore