Add a build option for sanitizer.
Add a build option for sanitizer.

elkingtonmcb/jubatus,gintenlabo/jubatus,jubatus/jubatus,elkingtonmcb/jubatus,Asuka52/jubatus,rimms/jubatus,rimms/jubatus,kmaehashi/jubatus,mathn/jubatus,roselleebarle04/jubatus,gintenlabo/jubatus,jubatus/jubatus,roselleebarle04/jubatus,kmaehashi/jubatus,Asuka52/jubatus,jubatus/jubatus,mathn/jubatus