Add note about removing cstdint to history.
Upgrade docs to quickbook 1.6.

Actually fixes a couple of errors where markup was used in table titles.
Move cstdint section to the end.

So that it doesn't appear in the middle of documentation for things that
are in the library.
Link to the cstdint documentation, rather than Boost.Config's root.
Merge pull request #4 from danieljames/doc-clean-up

Documentation clean up