Updating tuple to draft technical report

[Chris Jefferson]

This update include/tr1/tuple brings tuple up to tr1 standard.

The parts just involving std::pair have moved to utility, the 
reference_wrapper has moved to functional. Therefore two new headers 
have been introduced.

One important note is that the reference_wrapper in functional is NOT 
complete. This is a slightly neatened up copy of the version which was 
previously in the tuple specification and does not implement the full 
extent of "2.1 Reference Wrappers" in the draft technical report. This 
is mainly because I suspect implementing this header will become much 
easier once the type_traits have been implemented (even just the 
compiler-indepedant ones). If anyone else who is better at template 
metaprogramming than me (not too hard) thinks implementing this is easy, 
then be my guest :)

Chris




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