Add direct link to specific event (#414)

[csash]

Resubmitting because my git skills suck... sorry

Adds a link above the comment section in the event detail view to a query that returns the event being viewed. I figure this probably won't get enough use to warrant its own icon in the event list and you'll probably already be looking at the detail view for any event you care about enough to want a direct link for it.

[berggren]

Looks good, thanks for contributing!

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this State. It's up to you to confirm consent of the commit author(s) and merge this pull request when appropriate.

[berggren]

CLA warning is wrong. This happens when you hit the update this branch button on GitHub. Was green before I hit the button.