use custom images for relation icons
Added a flag to enable the databinding functionality in the Viewlet Manager so that it can be used without databinding
Merge pull request #108 from garyposter/rel-indicator

This simply hooks up relation icons per the design.  If you want to QA, turn on the feature flag (`http://localhost:8888/:flags:/relationCollections/`), make a relation, and verify that the green circle shows up.  The aggregatedStatus function is just a stub at this point, so it will only ever be green in this go-round.
Merge pull request #109 from hatched/toggle-viewlet-databinding

__To QA__
We just need to make sure that the databinding still works:
- deploy wordpress
- open the inspector to the configuration tab
- run ```var srv = app.db.services.item(0); var cfg = srv.getAttrs().config; cfg.debug = 'yes'; srv.set('config', cfg);```
- the "debug" option should now read yes