User-define literals for std::complex.

[Ed Smith-Rowland <3dw4rd at verizon dot net>]

Greetings,

The complex user-defined literals finally passed (n3779) with the 
resolution to DR1473 allowing the suffix id to touch the quotes (Can't 
find it but I put it in not too long ago).
(http://wiki.edg.com/twiki/pub/Wg21chicago2013/LibraryWorkingGroup/N3779-complex_literals.pdf)

Actually, I think allowing space between quotes and suffix ID was a mistake.

Also it looks like they are *removing* inline from the 'namespace 
literals' so that 'using std;' brings in the literals but that will be a 
later patch for all literals at once.

This has been bootstrapped and regtested on x86_64-linux.

As a general stylistic guide for the library I think I'll put
  operator""abc(...)
with no spaces.  Later.

OK?

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