refresh market data

[jhirschibar]

Larger ticket, will be split into multiple eventually. Work to complete the refresh logic for market data. Things to do:

• generate args based on the most recent dates pulled, the start_date and the expiration date.
• job to mark when options tickers are "complete"
• run the migration to the db based on the schema changes that already are committed
• refresh.py similar to download.py but will have the particulars for the refresh logic and arg generation.