pom.xml
	Adding heritrix-engine dependency

XmlCrawlSummaryReport.java
	XML version of the CrawlSummaryReport

ExtractorYoutubeFormatStream.java
	Adding sample bean to docs
merged Kenji's change to hbase de-duplication module:
- SingleHBaseTable using single HTable instances (no HTablePool) with
backing-off upon communication errors.
- FetchHistoryHelper for allowing multiple crawl history sources.
- row key backward compatibility mode.