commit of the 'swift' port of push-quickstart

The port is now in full feature parity with the objc-version and in particular it contains:

- CRUD and Push functionality (with content-available support) implemented
- Sections support at the tableviews for quick access to a particular section
- SearchBar functionality at the top of the tableview for easy access across big lists

let me know what you think.

done for [AGIOS-220](https://issues.jboss.org/browse/AGIOS-220)