extract and rename methods in TablePatcher
bulk remove unseen rows
generate our own ids
run a lean table patcher

We don't load the whole table in memory but we make lots of databaes
queries. The only way to handle huge tables like `vote`.
Merge branch 'optimize-table-patcher'
simplify procfile
only run delete if there are unseen items
refactor `use_cdep_opener` flag
modified init.py and scraper_curata.py
Merge branch 'master' of https://github.com/mgax/mptracker into issue#19
modified init.py, scraper_curata, @calls by ./manage.py scraper get_romania_curata