simplified RLE example using defaults for reduce_by_key()
simplified RLE example using defaults for reduce_by_key()

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