Fix documentation of BOOST_NETWORK_ENABLE_HTTPS

Fixes #429

Addresses comments by @povilasb on improvements to previous PR that
documents the circumstances where BOOST_NETWORK_ENABLE_HTTPS would be
set and be useful.
Regenerate updated documentation
Merge pull request #434 from deanberris/0.11-devel-docfix-https-refinement

0.11 devel docfix https refinement
Fixed bug in getting the authority when there are parts missing.
Fix compilation errors for projects using BOOST_BIND_NO_PLACEHOLDERS.
Merge pull request #437 from kzemek/0.11-devel-BOOST_BIND_NO_PLACEHOLDERS

Fix compilation errors for projects using BOOST_BIND_NO_PLACEHOLDERS.
Merge pull request #436 from glynos/issue_364

Fixed bug in getting the authority when there are parts missing.
Add .clang-format to 0.11-devel
Tweak clang-format config.
clang-format -i `find . -name "*.*pp"`
Do not indent namespaces.
clang-format -i `find . -name "*.*pp"`
Always break template decls
clang-format -i `find . -name "*.*pp"`
Add CI for Boost 1.55 and 1.56
Merge pull request #438 from deanberris/0.11-devel-clangformat

clang-format 0.11-devel
Workaround Boost.Optional 1.56.0 MSVC 2010 Issue

This change takes the advice of the Boost.Optional maintainer when
working around the breaking changes in Boost.Optional 1.56.0 --
apparently MSVC has a bug in copy-construction resolution which
considers multiple conversions (not a standard-conforming extension)
and because of changes to the Boost.Optional interface is being hit.

This commit only works around the MSVC 2010 compiler. It may be that
the bug is also in newer versions of the compiler, but that I'm less
sure about.
Apparently 1.56.0 is not supported yet
Enable workaround for higher versions of MSVC.
Merge pull request #439 from deanberris/0.11-devel-travis-newboosts

Add CI for Boost 1.55 and 1.56