Migrate photo to new /v2/photomap.location API call

[mvl22]

The photo addition needs to be migrated to the CycleStreets API V2:
http://www.cyclestreets.net/api/v2/photomap.location/

at
https://github.com/cyclestreets/mobileweb/blob/master/js/cyclestreets.js#L277