Make bitshift.crawler.crawl executable as a module.

[benattal]

• [x] Run the crawler via py python -m bitshift.crawler.crawl
• [x] Add parser initialization statements/calls.

[sevko]

@breuckelen , status on this?

[benattal]

I made it so the crawl function starts up the parsers. I didn't add any calls to the actual parse function -- didn't you do that @sevko?

[benattal]

If you did, then we should be good to go.

[earwig]

Yes.