refs #188 verify_fail_if_no_peer_cert + moving common asio/ssl code into gu_asio.hpp
refs #188 moved common asio/ssl code under galerautils, moved ist::Sender socket initialization after ssl context is prepared
refs #188 cleanups
refs #188 added missing gu_asio.hpp
Merge pull request #192 from codership/gh188

closes #188 - merging branch gh188