Log Message:
Chamges 1.57.0:
Updated Libraries
Any:
RTTI is not required any more (TypeIndex library is used for RTTI emulation)
Fixed 8958

Asio:
Fixed the kqueue reactor so that it works on FreeBSD.
Fixed an issue in the kqueue reactor which resulted in spinning when using \ 
serial ports on Mac OS.
Fixed kqueue reactor support for read-only file descriptors.
Fixed a compile error when using the /dev/poll reactor.
Changed the Windows backend to use WSASocketW, as WSASocketA has been deprecated.
Fixed some warnings reported by Visual C++ 2013.
Fixed integer type used in the WinRT version of the byte-order conversion functions.
Changed documentation to indicate that use_future and spawn() are not made \ 
available when including the asio.hpp convenience header.
Explicitly marked asio::strand as deprecated. Use asio::io_service::strand instead.

Circular Buffer:
Fixed some warnings and move_if_noexcept from Boost.Move is used

Config:
BOOST_HAS_PRAGMA_DETECT_MISMATCH macro was added

Container:
Added support for initializer_list.
Fixed double destruction bugs in vector and backward expansion capable allocators.

Coroutine:
optionally register stacks with valgrind
10386 MSVC link error in asymmetric_coroutine.hpp: symbol already defined
10536 call to 'begin(...pull_coroutine< R > & c)' is ambiguous

Flyweight:
Added serialization support via Boost Serialization.
flyweight default constructor was made explicit in Boost 1.56, which introduces \ 
a regression in some initialization scenarios. The former non-explicit default \ 
constructor has been restored

More...