Commit monitor search index debounce / throttling

[joepio]

When a Commit is handled by Atomic-Server, it updates the search index only if it hasn't done so in the past 15 seconds. This is because this is an expensive operation, and it isn't bad if it takes a while to find your edit.

However, this leads to a problem: if you make your edit, and then do nothing for 15 seconds, the update is not indexed. It is only indexed when anyone makes any new commit.

In a highly active server, this will be fine. But if you are the only user, it can become really frustrating!

So I think this should be some sort of periodic runner.

[joepio]

Fixed