Fix tim callback_url config

It was moved to settings.yml as part of
https://github.com/aeolusproject/conductor/commit/4469dcf7e54adc .
This fix is needed so dev-tools has the callback_url correctly
configured for conductor starting with the above commit.
Merge pull request #29 from cwolferh/callback_url_now_in_settings_yml

Fix tim callback_url config