This small patch adds c++-mode support for new C++11 keywords.

My employer, Google, has a copyright assignment on file.


2013-03-04  Michael Shields  <shields@msrl.com>

	* lisp/progmodes/cc-langs.el: Add support for new C++11 keywords
	"alignas", "alignof", "constexpr", "decltype", "nullptr", and
	"thread_local".