Added v basic return of template with property number

No real functionality.

Renamed app_test.py to test_app.py for discovery by pytest.

Added requirements_test.txt for installing pytest.
Update .travis.yml

oops borked tests
Updated to make call to titles api
Merge branch 'view-property-page' of github.com:LandRegistry/property into view-property-page
Merge pull request #1 from LandRegistry/view-property-page

Added v basic return of template with property number