Replace SearchStatus with Status type

[sid-kap]

According to https://dev.twitter.com/rest/reference/get/search/tweets, the Search API now returns more detailed Tweet objects:

In API v1.1, the response format of the Search API has been improved to return Tweet objects more similar to the objects you’ll find across the REST API and platform. However, perspectival attributes (fields that pertain to the perspective of the authenticating user) are not currently supported on this endpoint.

The website is not very detailed about this, but I tested the search API with this change and all the fields of Status were there, and everything worked fine.

[sid-kap]

If you would like, I'd be happy to add a test to show that this feature is indeed working.

[sid-kap]

It seems like the Travis test failed because stack could not be downloaded, so we might need to re-run the test.

[sid-kap]

Thanks!