Don't report to Yeller 'redeploying non snapshots is not allowed' exception

[danielcompton]

We are currently reporting redeploying non-snapshots is not allowed (see http://git.io/vO2Tg) errors to Yeller. These are not worth reporting to Yeller, as they are not exceptional, and don't indicate any error on our part. We could just ignore them, but it feels cleaner to actually work out how to not report them.

[danielcompton]

One option would be to add a :report? false key to the ex-data map we return, but I'm not sure if this is the best approach. @tcrayford do you have any patterns for wrapping ring exceptions and ignoring some of them?

[tcrayford]

@danielcompton right now Yeller's clients don't have a thing like that. I think the right solution here is probably to allow y'all to provide a callback that determines if Yeller sends an error or not. the JS notifier has that, and it's turned out to be very useful.

[tobias]

If we did use :report? false in the ex-data, we could filter that here: https://github.com/clojars/clojars-web/tree/master/src/clojars/errors.clj#L36, and wouldn't necessarily need a callback in the yeller client (though I could see how that would be generally useful).