Fix Flickr API to use SSL

New API keys will be issued for HTTPS access only: as of 6 May 2014
First blackout test window: 3 June 2014, 10:00-12:00 Pacific Daylight Time (PDT)
Second blackout test window: 17 June 2014, 18:00-20:00 (PDT)
Non-SSL API deprecated: 27 June 2014, 10:00 (PDT)