Merge pull request #165 from hatched/constraints-to-view

To QA
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Make sure you can change the values for the constraints in the ghost and service inspector. Also testing the databinding functionality using:

```var srv = app.db.services.item(0); var cst = srv.get('constraints'); cst['cpu-cores'] = '110'; srv.set('constraints', cst);```
Converted the ghost viewlet into a Y.View.
Fixed failing tests from the ghost config viewlet to view conversion.