Double DoneUploads in server logs

[crspybits]

At the same time when #158 arose, I was looking into the log files and saw a "double" DoneUploads from Rod. The second one failed due to a master version update. i.e., the master version sent to the server was incorrect. It had no actual uploads being committed-- i.e., the prior DoneUploads actually succeeded.

Additional oddly, it seemed that the two DoneUploads were separated by 10 minutes.

I'm putting this as a SharedImages issue because it seems like a client issue, though actually perhaps an iOS client issue, rather than a server issue.

[crspybits]

Looking more extensively at the logs, there are other instances of master version updates. I wonder if this was some kind of timing issue/race condition with Rod's app.