Epic: photos workflow overhaul.

[Br3nda]

Copied from #1783

• . If the photo is CC licensed, we make a medium resolution copy on s3 at the time of model record creation.
• Image licensing #465
• rake task that removes references to photos that don't exist on Flickr anymore #1949
• We start supporting other photo services that have copyleft licenses OR users can relicence.
• Allow direct photo upload #513
• Add google picker photo upload support #1378
• The user can be given a list of plantings to photograph one by one.
• They can upload several an associate with plantings in one go. (reducing the back and forth it has now.)
• We prompt users somewhere to take photos periodically
• We associate photos with a life stage of a plant, based in dates. Eg seedlings versus harvesting plantings.

[CloCkWeRX]

#2167 acheives the copyleft implementation.