add a server example
Merge branch 'master' into example
Merge branch 'develop' into example
refactor hello-server.cpp
refactor CMakeLists.txt
Merge branch 'develop' into example
Merge branch 'develop' into example
Merge branch 'develop' into example
refactor CMakeLists.txt
Merge branch 'develop' into example
Merge branch 'master' into example
update examples
Merge branch 'develop' into example
introduce LIBNODE_DEBUG_TRACE_ON and LIBNODE_DEBUG_TRACE_OFF
introduce LIBNODE_DEBUG_TRACE_ON and LIBNODE_DEBUG_TRACE_OFF
add '#ifdef LIBNODE_DEBUG'
Merge branch 'develop' into example
Merge branch 'develop' into example
clear fields_ and values_
update submodule 'libj'