webmagic-0.3.0

• Change default XPath selector from HtmlCleaner to Xsoup.

  Xsoup is an XPath selector based on Jsoup written by me. It has much better performance than HtmlCleaner.

  Time of processing a page is reduced from 7~9ms to 0.4ms.

  If Xsoup is not stable for your usage, just use Spider.xsoupOff() to turn off it and report an issue to me!

• Add cycle retry times for Site.

  When cycle retry times is set, Spider will put the url which downloading failed back to scheduler, and retry after a cycle of queue.