fix bug 1112209 - generate missing_symbols report

r? @selenamarie or @peterbe (or anybody really) - this is somewhat urgent.

I actually wrote a crontabber job for this, but then I realized that I was doin' it wrong.. 
1) postgres can do the work faster w/ COPY ... WITH CSV
2) this job is going away after we go to AWS and lose crash-analysis, anyway

Really this should be replaced later with an API IMHO. So, let's just rename and replace the current ```cron_modulelist.sh```.