Spring Data version of travel sample app

See the Java, Node.js, and Python updates - and talk to Maria Shodunke about the front-end and Swagger.

A Spring Data version needs to be an example of best practice with Spring + Couchbase, to answer a lot of customer questions as they begin to look at Spring Data with CB Server.

The Travel Sample Application introduces customers to using Couchbase through the SDKs, by demonstrating an app which authenticates against a cluster, and performs queries and searches.

The 7.0 updates to work with Collections can be seen in:

• https://github.com/couchbaselabs/try-cb-java
• https://github.com/couchbaselabs/try-cb-nodejs
• https://github.com/couchbaselabs/try-cb-python

& the front end is at https://github.com/couchbaselabs/try-cb-frontend-v2