Java Documentation Update for Travel Sample for Couchbase 4.5 Features

In support of the application update (JCBC-1002), update the documentation with the new tutorial.

This update could either be two documents, one conceptual and one a series of steps or it could be a set of included content and a single document per SDK. Either way, it should have the content more step oriented than the current docs and should be specific to the SDK.

The current sample application doc lives at http://developer.couchbase.com/documentation/server/4.5/sdk/sample-application.html