series_filter and live_filter written
timeseries models and timeseries scrapers also updated for new split_on_indexes formatting
refactored timeseries.helpers; added isoformat and sort-by-time to split_on_indexes
data_download.py updated for new data format (**includes null columns**)

(also got rid of a random debug printout)
updated commonsapi.js
updated data_api (mostly just comments update, since body of changes are in helpers.py)
schema() indexes will be [] instead of [None] when there are no indexes
seriespicker updated