Update photo import code to do all the things with tickets (in a queue if necessary)

[straup]

• write upload to tmp
• write db record (ticket id, photo id, secrets)
• create redis "state" record (if present)
• extract meta to JSON (pymdeco or pure PHP)
• encrypt meta (optional)
• strip meta (optional)
• store meta
• store original
• resize / store versions: big (3K?) large (1024) medium (640) small (240)
• extract colours (from medium)
• extract metrics (from big)
• resize / store square (300) from big
• update redis "state" record along the way (if present)
• update ticket record with dimensions, etc (JSON blob) along the way
• create photo record from ticket record
• delete ticket record
• delete original (maybe?)