Updated models and scraper, database migration 002
Fixed fields, added import script

Set all fields to blank=True and non-string fields to null=True
Added new field, modified scraper to import

Added "date_sample_update" field. Updated scraper to check/import data
from SoS and AG sites into database. Updated requirements.txt. Modified
scraper-importer to work as django-admin command.
Fixed scraper-import bug that added duplicates
Updated scraper to handle Qualified

Also created test script to try out any new scenarios we come across on
SoS site with qualified measures. Currently handles 6. Finally, added
field proposition_type to Db
Add scraping for pending-AG-review initiatives

Also created new field "date_sum_estimate" for initiatives pending AG
review and modified/renamed qual_test.py to scraper_test.py to handle
all tests for scraper_sos_import.py.
Added CommanderAdmin, set InitiativeAdmin layout