Implement new bridge user counting algorithm (was Why don't .ir bridge users fall off when Tor gets censored by DPI?)

https://metrics.torproject.org/users.html?graph=direct-users&start=2012-12-01&end=2013-03-13&country=ir&events=points#direct-users sees a pretty clear fall-off. But https://metrics.torproject.org/users.html?graph=bridge-users&start=2012-12-01&end=2013-03-13&country=ir#bridge-users doesn't show any sort of drop-off.

Similarly, https://metrics.torproject.org/users.html?graph=direct-users&start=2012-12-01&end=2013-03-13&country=sy&events=points#direct-users sees very clear blocking of Tor users, and I assume it's by DPI also (actually I've been assuming it's all SSL), but then the bridge graph doesn't look at all like this: https://metrics.torproject.org/users.html?graph=bridge-users&start=2012-12-01&end=2013-03-13&country=sy#bridge-users

Is our new bridge user counting algorithm wrong in some way? Or are the connections arriving at the bridges, and they're counting them, even if the SSL handshake doesn't finish? Or does it finish but just not proceed past that?

At this point I'm avoiding showing the bridge graphs to funders, since they make no sense to me.