Include rack-mini-profiler in development
Add web_url to worldwide org offices in API.

So that mainstream tools can link to the pages instead of having to
include reams of access/opening hours information etc.
Merge pull request #808 from alphagov/rack-mini-profiler

Include rack-mini-profiler in development
Merge pull request #811 from alphagov/add_worldwide_office_web_url

Add web_url to worldwide org offices in API.