Some refactoring of the main function in crawl.py (and collateral)

Summary

I was going to add some new stuff to main but decided to suggest some clean up first.

Focus

1. updateList member of the Crawler was renamed to targetData. An to_be_inserted and an to_be_updated lists are created later. Thus, updateList could be confused with to_be_updated (and I did). The old updateList actually represents how Records and so on should look like, i.e. the target state of the data.
2. Renamed and documented arguments of the main function (which is now only called main)

Test Environment

Existing tests.

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