Explicitly set result_type to the apparent default now, 'recent'
Change from min/max to windowing algorithm
Set window_start/end better
Fix logic at first time run
Only jump forward from any window_start we have
Improve logging
When resetting window, new start must be highest id we had so far not current shifted end
A few logic fixes
Fix logic with onetime
Can return none
Merge pull request #38 from scraperwiki/fix-min-max-bug

Fix min max bug