fix compile error

 - add consturctor to request
 - remove unused type using
 - include "logging.h" from dumb_timer_queue.h (who uses CROW_LOG_DEBUG)
change default log level to INFO
travis CI build configuration file
travis add boost install
change libboost-dev to libboost-all-dev
travis configuration update: g++-4.8, cmake check
travis add-repository
travis update boost-latest, CMakeLists.txt boost version update
remove clang from travis