changed extract-paired-reads test to not create output directory
changed extract-paired-reads test to not create output directory

F1000Research/khmer,F1000Research/khmer,ged-lab/khmer,souravsingh/khmer,F1000Research/khmer,souravsingh/khmer,souravsingh/khmer,ged-lab/khmer,ged-lab/khmer,Winterflower/khmer,Winterflower/khmer,Winterflower/khmer