Fix blacklist acceptance test
Compute historical activity
Merge pull request #12 from edx/gabe/fix-blacklist

Fix blacklist acceptance test
Merge pull request #11 from edx/gabe/user-activity-per-week

Compute historical user activity
Grade and "viewed" distributions from courseware_studenmodule/sqoop
starting acceptance test
Remove tasks that originate from an existing sql csv dump
use overwrite parameter for everything
handle if marker table is absent
hardcodes export overwrite, rename param for import overwrite