• Add useIncognitoPages option to PuppeteerPool to enable opening new pages in incognito
  browser contexts. This is useful to keep cookies and cache unique for each page.
• Added options to load every content type in CheerioCrawler.
  There are new options body and contentType in handlePageFunction for this purposes.
• DEPRECATED: CheerioCrawler html option in handlePageFunction was replaced with body option.