[c++0x] unique_ptr.hpp implementation

[Chris Fairles]

Attached is an implementation of unique_ptr (according to
N2315=07-0175) along with a test suite (albiet, incomplete). This
implementation is largely based on:
http://home.twcny.rr.com/hinnant/cpp_extensions/unique_ptr.html

Noteable differences are:
- uses c++0x type traits (enable_if, conditional etc)
- EBO without the use of boost's compreessed_ptr
- disable reset in array specializations for convertible pointer types
- use pointer-to-private-member for unspecified bool/pointer types

Issues:
- should you be able to use function pointers as a deleter? i.e.
void d(int *p){delete p;}
int* p = new int;
unique_ptr<int, void(*)(int*)> ptr(p, &d);
- can't use member function ptrs in a similar manner since you have to
use .* or ->* to call member function and that requires an object
which you don't have

I'd appreciate some feedback, like how well it fits the standard since
this is my first attempt at implementing straight out of a c++ std.
Any design issues or subtle flaws as well.

Cheers,
Chris

P.S. I'm using latest gcc svn head to compile/test this (rev. 127375).
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