Add general resolver to importer

That won't quite do it, because the popover library binds to the class `popover-accept` and this particular callback binds to `resolver-popover-accept`. Binding an event to the returned stream would screw up other users of the popover lib.

What might work is something like:
```javascript
var resolverAcceptStream = popover.init($container);
resolverAcceptStream.filter(f).onValue(updateRow, options, $container);
```
Where f = <function that checks event target for resolver-popover-accept>