Scraping ratings, skipping (hopefully) all problem pages, pages with too
little or no data. Also created special versions of the program
(ratebeercacher and ratebeercacher2) to read ahead and cache so that
when the main program arrives there, most of the slowest part
(downloading) will be cached.

Essentially run the 3 scripts. Logic for filtering out and not
overwriting the .csv main files is in the main program. Ideally, that
should be in the command-line options.