Get contexts for postmortem

[jdarling]

It would be great if their was an event emitted for the context ready with its _uid and data. That way the information could be stashed off in a database, file, or somewhere for postmortem efforts.

EG: I know I have a bad account in a list of accounts, but the only way to find it right now is to go look at each one manually till I find the wrong one. With the context's could look at the context request, align it to the uid in the errors and poof I now have something to look at.

[hassy]

Good suggestion. This is too low-level to be useful to all but the most power of users so I'll create an issue in the main repo to discuss how postmortem analysis / reporting of requests that are causing 404s / 500s etc could work.