changed default callback queue to be adaptive to calling thread
changed default callback queue to be adaptive to calling thread

MattesGroeger/BrightFutures,morizotter/BrightFutures,hoanganh6491/BrightFutures,Noobish1/BrightFutures,morizotter/BrightFutures,Noobish1/BrightFutures,Thomvis/BrightFutures,MattesGroeger/BrightFutures,zhaar/BrightFutures,Thomvis/BrightFutures,hoanganh6491/BrightFutures,tranhieutt/BrightFutures,zenkimoto/BrightFutures,tranhieutt/BrightFutures,zenkimoto/BrightFutures,zhaar/BrightFutures