LP#1646166 Hatch printing multi root-node templates

LP#1646166 Hatch printing multi root-node templates

Print templates with no root element or root elements that contained
necessary attributes (id, style, etc.) failed to print correctly in
some casese with Hatch HTML printing because the root node was dropped
after compilation.  This commit changes how we extract the compiled HTML
from the page, using the more reliable method of pulling it directly
from the print element div instead of inspecting the compiled nodes.

Commit also wraps all content in <html/><body/> for good measure.

Signed-off-by: Bill Erickson <berickxx@gmail.com>