Quickbook: Merge from trunk to quickbook-dev

svn path=/branches/quickbook-dev/libs/asio/; revision=75739
Quickbook: Merge to quickbook-dev

svn path=/branches/quickbook-dev/boost/asio.hpp; revision=76630
Quickbook: Merge from trunk.

Includes blocks in lists fixes, and some documentation changes.

svn path=/branches/quickbook-dev/boost/asio/; revision=77347