Fix feed posts

[Related thread](https://forums.hummingbird.me/t/updates-on-profile-page-not-loading-unless-refresh/15502)

#### User Profile

The issue was that new stories were being added via:

```javascript
this.currentModel.unshiftObject(story);
```

however, the `currentModel` attribute was set to an empty array instead of the actual model context.

#### Dashboard

The issue was that when a user clicked the "{x} new stories" alert, it set the `content` on the controller directly. That caused the routes `context`, and controllers `content` to be out of sync, and as new stories are added via the `this.currentModel` attribute on the route object, it wasn't being shown.

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Also includes another fix that was causing issues with ember inspector.