add support for boost 1.66 with Boost.Beast

[venediktov]

New Boost.Beast is out there , we should look into adding it to CRUD library ?

[vinniefalco]

I can help with the design if you want to go in this direction

[venediktov]

That sounds great if you could help with Boost.Beast and in general if you see something that is wrong please let us know.

The library though is used in our other project as git-subtree vanilla-rtb

So if Boost.Beast can be conditionally included by CMake -DBOOST_BEAST_ENABLED or even better if CMake could automatically detect

• Version of Boost
• Or detect Boost.Beast

Whatever makes more sense .