drill

42006ad3 - DRILL-5050: C++ client library has symbol resolution issues when loaded by a process that already uses boost::asio

DRILL-5050: C++ client library has symbol resolution issues when loaded by a process that already uses boost::asio Build with Boost static libs and drill_boost namespace on mac. Added readme with instructions DRILL-5050: Addressed review comments DRILL-5050: address more review comments close apache/drill#659