Commented Issue: HashTags are null with Tweet with photo [2548]

Consider the following code:

```
//Tweet 588403629956190209:
//When live gives you lemons... #motivational http://t.co/YvofkvOS8J

var tweet = Tweet.GetTweet(588403629956190209);

if (tweet.Hashtags == null || tweet.Hashtags.Count != 1)
{
throw new Exception("We have a problem. Hashtags are not okay.");
}
```

When I use a photo (might be a link), the HashTags collection remains null. It should have 1 "#motivational". I've encountered this behavior also when I'm reading the tweet from a timeline.

Using release 0.9.6.0.
Comments: Create a second class implementing ITweetEntities that will aggregate both Entities and LegacyEntities