Fade/hide units/machines in machine view on command.
Tests added for new events.
Add attr docs.
Display added services in the sidebar.

Adds the actual services to the new sidebar view. Will respond to
database add and remove events.
Yay test fix?
Merge pull request #615 from makyo/fade-highlight-machines

Fade/highlight units/machines in machine view.
Merge pull request #614 from kadams54/added-services-list

Add the list of services to the new service bar.

Displays added services in the sidebar, as well as supporting navigation between charmbrowser and this new view.