libcxx patch for N3655

[Marshall Clow]

In N3655 (the first half of which was incorporated into C++14), Walter added a bunch of template aliases to simplify template metaprogramming.

Lots of stuff like this:
	template <class T> using remove_const_t    = typename remove_const<T>::type;

This patch adds all those aliases into libc++, and tests.
Also some drive-by cleanups of existing tests.

-- 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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