Remove duplicate using declarations.
Remove duplicate using declarations.

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