fix(jqLite): better support for xhtml

it turns out that some stuff doesn't work in xhtml as it does in html.

for example   can't be innerHTML-ed and auto-closing of elements
doesn't work.

the reporter of the referenced issue claimed that innerHTML vs text on
script made a difference but that doesn't appear to be true in my testing.

I'm not including test for this because testacular doesn't currently
run tests in xhtml yet.

Closes #1301