Convert MatchesStatusCodeDecideRule and NotMatchesStatusCodeDecideRule to use CrawlURI.getFetchStatus() to avoid null status codes and broaden use.
Added test cases for MatchesStatusCodeDecideRule and NotMatchesStatusCodeDecideRule
Fix comments for youtube extractor.
FIX: Add ArchiveRecordHeader.getContentLength() to specifically return the warc/arc record content length,
not including headers