Update to boost_1_56_0.tar.gz
Merge branch 'boost'

* boost:
  Update to boost_1_56_0.tar.gz

Conflicts:
	boost/atomic/detail/cas128strong.hpp
	boost/atomic/detail/gcc-atomic.hpp
	boost/atomic/detail/platform.hpp
	tools/build/v2/tools/darwin.jam
	b2
	b2.exe