Final updates required for v.3.0.0

* Adds support for the [Pull Push Destination](http://dev.datasift.com/docs/push/connectors/pull)
* Adds support for DataSift [Historics Preview](http://dev.datasift.com/docs/historics/preview)
* Adds support for multi-streaming via WebSockets
* Added a CLI to the library
* Updated test suite

Also resolves #50.