AJAXey commenting on notes from the browse page.
Set things up for OAuth to work with AJAX requests.
Clear the textarea after a comment is made successfully.
Show an empty comments block and hide it until a comment is made.
Use hidden class instead of inline style.
Use the comment's html content so that it's properly escaped.
Fix "where am I" on the edit page
Fix "view larger map" link in HTML sharing
Fix detection of timeouts
Use render.openstreetmap.org for mapnik exports
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
Merge remote-tracking branch 'iandees/ajaxy_note_browsing' into next

Conflicts:
	app/assets/javascripts/browse.js
	app/views/browse/note.html.erb