Patch implementing n3654 (quoted strings)

[Marshall Clow]

A more substantial patch than the last two.
Reference:
	http://wiki.edg.com/twiki/pub/Wg21bristol/FormalMotions/N3654.html

Needs more tests - and I'm working on those.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

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