CXX-65 add set to mutexdebugger
CXX-141 drop collection before insert demo
CXX-141 general cleanup of insert_demo
CXX-143 remove src/mongo/s
CXX-144 remove listen.cpp
CXX-144 remove listen.h
CXX-133 Update travis configuration to run client examples
minor: authTest example now works on MonogDB < 2.5.3