add timeout for get_model RPC (fix #720)
add timeout for get_model RPC (fix #720)

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