Support for Sentry #415
Add Sentry's error reporting.
I'll add the necessary keys (on dissem.in and sandbox maybe) by myself once it's merged.
(if no key is specified, it won't interfere / throw an error / fail / crash / burn your house, no worries.)
Here the reference for Django
I should document this…
Also, once I get approval from sentry.io for open source Sentry, I'll enable GitHub auth through the Dissemin org, so that everyone in the org can access to the Sentry Dissemin's org.