New version of boost!

Boost 1.66 is out!

From the article:

New Libraries

• Beast: Portable HTTP, WebSocket, and network operations using only C++11 and Boost.Asio, from Vinnie Falco.
• CallableTraits: A spiritual successor to Boost.FunctionTypes, Boost.CallableTraits is a header-only C++11 library for the compile-time inspection and manipulation of all 'callable' types. Additional support for C++17 features, from Barrett Adair.
• Mp11: A C++11 metaprogramming library, from Peter Dimov.

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