refactor(tiles app): Refactor to use a local json data source and add some fields on detail page.

There are numerous issues with both the real Northwind sampel OData service as well as the mock one provided in the UI5 SDK. Replace with local json sample data.
Enchance the detail page to show a couple of controls instead of an empty page.

Fixes #61
test(tiles app): change expected files to reflect new sample json.
Merge pull request #62 from js1972/develop

refactor(tiles app): Refactor to use a local json data source and add some fields on detail page.