Add ability to scrape property details

[gbp]

This is based on work done by mySociety as part of the MHCLG Central Register of Planning Permissions project.

It adds ability to scrape property details (UPRN, address, postcode, etc..) from Idox planning portals by adding a .include_property option.

This was only really intended as a quick test, to get more data to work with on our project, but maybe it might come in useful for other people too.

Example

pp UKPlanningScraper::Authority.named('Westminster').
                                decided_days(7).
                                include_property.
                                scrape

Notes

• Commit 74e3121 isn't strictly necessary but added to make later commit diffs clearer.