Rename edit extent JS object

So it doesn't collide with other maps.
sell solicitor todo list
Merge pull request #40 from LandRegistry/rename-edit-extent-js-object

Rename edit extent JS object
Merge pull request #42 from LandRegistry/sell_solicitor_todo_list

sell solicitor todo list
Merge pull request #44 from LandRegistry/make-single-map-extent-a-reusable-library

Make single extent map a reusable library
Add sell find property page