Update to iD v1.1.2
Support background hash parameter for iD

Fixes systemed/iD#1590
Fixes systemed/iD#1682
Set longitude correctly in "where am I" lookups from the edit page
Update tests with new URL for mapnik exports
Strengthen password hashing algorithm
Upgrade passwords to the latest hashing scheme on login
Add an og:image meta tag

Without this, links to OpenStreetMap.org shared via Facebook
default to the ad image.

Fixes systemed/iD#1644
Tweak layer levels
Update Nominatim description terms
Need to preventDefault on href='#' links

Fixes https://trac.openstreetmap.org/ticket/4947
Update to iD v1.1.3