bulk-loading.xml
Deprecated stand-alone HTML page that contained bulk-loading docs. Left the page in the repo for backward compatibility since so many people have linked to it over the years, but points to new Arch section.
book.xml
Added new Arch section for bulk loading
ops_mgt.xml
Significantly expanded documentation on ImportTsv.
Added entry for completebulkload.
Added short entry on the Driver class (for MR jobs)