118 boost integration

[anarthal]

This addresses what's missing to make this library Boost compliant:

• Documentation is now built using b2 target boostrelease, via Doxygen, and copied to the standard doc/html location.
• Added documentation redirection file.
• Updated documentation to match Boost conventions.
• Updated CMakeLists.txt to comply with what's recommended by boostdep --cmake redis.
• CMake now doesn't fail if OpenSSL is not found when running from the superproject.
• Added test/cmake_test.
• Updated the CMake CI to test the CMake workflows recommended by Boost.CI, as well as some other workflows I've found relevant in other libraries.
• Added test/Jamfile.
• Added CI jobs to test B2 builds.
• CI workflows now test with the master and develop branches of Boost, instead of with pre-built Boost distributions.
• Added meta/libraries.json.
• Fixed some documentation issues.
• Fixed a Windows link error due to Boost.Test.
• Renamed examples and tests folders to example and test to match the Boost requirements.

close #118

[mzimbres]

Awesome. It would have taken weeks for me to do this job.