Switched to python for all site scraping and feed management to avoid adding more
dependencies.

Switched to lxml instead of BeautifulSoup:
  xpath traversal is faster and more expressive than DOM traversal.

Tweaked a few tables to add missing columns and remove extraneous columns.

Added a url_queues table to track comment state between us and FCC.
reindent to 4 spaces
stop pushing document urls into url_queues;
it's redundant to filing_docs.url and uselessly extends
feed parsing time.
watch those KeyErrors
more stuff to ignore
psycopg2 does not support context management protocol. undo with statement