Boost 1.37 released

Boost 1.37 is out. This marks another release on Boost's new schedule and well done to everybody for managing to get it done.

There is one new library, Proto, for making embedded domain specific languages (EDSLs) in C++ together with updates to several other libraries (Asio, Circular Buffer, Dynamic Bitset, Hash, Interprocess, Intrusive, Math, Type Traits, and Unordered)