use str
Merge pull request #48 from scraperwiki/bignum

use str
specify columns to preserve order across datasets - fix #22
startup: create table
Merge pull request #49 from scraperwiki/allfields

specify columns to preserve order across datasets - fix #22
Introduce max_id_ever_seen state
Use __max_id table for highest id seen
drop the table that contains the __max_id state
Merge pull request #50 from scraperwiki/fix-max-id-index

Introduce max_id_ever_seen state
Move sql.save to before max_id update
Merge pull request #52 from scraperwiki/ordering-bugfix

Move sql.save to before max_id update
Remove duplicate httplib import
Various PEP8 fixes