Fix: dashboard filters broken after #252

[arikfr]

Switched to using promises to know when QueryResults are ready. The current implementation is a bit crude, but I didn't want to change all other uses of QueryResult. In the long run I think we should switch to using only promises -- will remove many watches and simplify the code in QueryView.

@amirnissim FYI.

[amirnissim]

$resource already has a promise, you can access it with:

var qr = QueryResult.get(...)
qr.$promise.then(...)

[arikfr]

@amirnissim QueryResult has $resource in it, but it's not a $resource.

[amirnissim]

we can still use it:

QueryResult = function() {
QueryResultResource = ...
this.$promise = QueryResultResource.$promise
...
}

I agree, we should refactor QueryResult ASAP

[arikfr]

For this specific case, we might have because we can assume we will have the query result id. But in other cases, it won't be enough.