fix for issue #129 deleate clear method in after_load function.
fix for issue #129
deleate clear method in after_load function.

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