Fix "method=" to "method_override=" in tree docs

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Fix up CSS for the resurrected HBase setup doc.
Merge remote-tracking branch 'remotes/Official/gh-pages' into gh-pages
Add docs for new settings: tsd.http.request.cors_headers and
tsd.storage.fix_duplicates