Add data-editor to the main edit tab

This ensures that the if the user's default editor is remote edit
then it will be triggered without a page reload.
Notice, and act on, changes to the layer parameter in the URL bar
Centre editors correctly when note=N is specified
Don't bother verifying an email address that hasn't changed
Return GPX traces as application/gpx+xml instead of text/xml
Improve installation documentation and add contributor instructions
Make sure we always have a base layer
Localisation updates from http://translatewiki.net.
Fix openid "remember me" label

It was targeting the wrong checkbox.
Remove banner ad section
Add additional icon tags to the HTML header
Tighten white space usage for geocode "View details" link
Fix sizing of scale control
Stop default layer flickering when notes or data are shown
Make the timestamp for a diary comment into a permalink for it
Use a view to build the trace RSS feed and get rid of OSM::GeoRSS
Update to rails 4.0.0
Monkey patch PostgreSQLAdapter to make enums work
Remove multiline regular expression anchors from validations
Replace attr_accessible with strong parameters