improved cuda::copy_if performance resolves issue #196
improved cuda::copy_if performance
resolves issue #196

google-code-export/thrust,UIKit0/thrust,Vishwa07/thrust,levendlee/thrust,malenie/thrust,UIKit0/thrust,allendaicool/thrust,julianromera/thrust,h1arshad/thrust,rdmenezes/thrust,julianromera/thrust,bfurtaw/thrust,hemmingway/thrust,hemmingway/thrust,malenie/thrust,h1arshad/thrust,lishi0927/thrust,google-code-export/thrust,hemmingway/thrust,lishi0927/thrust,Vishwa07/thrust,julianromera/thrust,lishi0927/thrust,levendlee/thrust,malenie/thrust,google-code-export/thrust,Vishwa07/thrust,h1arshad/thrust,hemmingway/thrust,levendlee/thrust,rdmenezes/thrust,allendaicool/thrust,bfurtaw/thrust,julianromera/thrust,lishi0927/thrust,UIKit0/thrust,google-code-export/thrust,bfurtaw/thrust,UIKit0/thrust,rdmenezes/thrust,Vishwa07/thrust,h1arshad/thrust,rdmenezes/thrust,malenie/thrust,bfurtaw/thrust,allendaicool/thrust,levendlee/thrust,allendaicool/thrust