Summary:
Nice title. We add three new transactions - IMAGE_FILE, IMAGE_NAME, and IMAGE_DESCRIPTION. The first is a bit like subscribers as it is a list of file phids. The latter have values of the form ($file_phid => $data), where $data is $name or $description respectively. This is because we need to collate transactions based on $file_phid...
Overall, this uses the _underyling files_ and not the "PholioImage" to determine if things are unique or not. That said, simply mark PholioImages as obsolete so inline comments about no-longer applicable PholioImages don't break.
Does a reasonable job implementing the mock. Note you can't "update" an image at this time, though you can delete and add at will.
Test Plan: played with pholio a ton.
Reviewers: epriestley
Reviewed By: epriestley
CC: chad, aran, Korvin
Maniphest Tasks: T3489
Differential Revision: https://secure.phabricator.com/D6441
