* Add script for pulling NFT trade data from nonfungible.com
* corrections for current state of API
* change data model to match data source
* change primary key
* pull data from initial dump first, then API
* pull all supported NFT's, not just cryptokitties
* disable problematic data sources
* rename function to satisfy linter
* Rename table to nonfungible_dot_com_trades
* rename parser module to nonfungible_dot_com from non_fungible_dot_com, for consistency
* correct mistaken reference to Bloxy
* rename NonfungibleDotComTrade to ...TradeResponse
* `NftTrade` -> `NonfungibleDotComTrade`
* rename files to match prior object renaming
* use fetchAsync instead of axios
* improve fetchAsync error message: include URL
* avoid non-null contraints in API trades too, not just for trades from the one-time dump
* disable mythereum publisher
* [WIP] pull OHLCV records from Crypto Compare
* lint
* refactor to pull logic out of script and into modules
* add entity test for ohlcv_external entity
* implement rate limit and chronological backfill for ohlcv
* add unit tests; cleanup variable names
* Fetch OHLCV pairs params from events table
* better method names
* fix outdated test
* lint
* Clean up after review
* oops
* fix failing test
* better filtering of most recent records
* fix bug when generating pairs
* fix default earliest backfill date
* fix bug with retrieving backfill time
* prettier
