ContenScraper speed bump optional / configurable

[KnutJaegersberg]

Not always I use the crawler, actually more often a content scraper following a predefined link path, so I can be sure the complete site is scraped.
The content scraper includes a sys.sleep(1), which slows him down. Removed it myself to make it faster. Also, the multithreaded scraping as in rcrawler should be available with the contentscraper, as well, I think.