updated extract-paired-reads to handle Casava 1.8
updated extract-paired-reads to handle Casava 1.8

Winterflower/khmer,Winterflower/khmer,jas14/khmer,jas14/khmer,Winterflower/khmer,F1000Research/khmer,kdmurray91/khmer,jas14/khmer,souravsingh/khmer,F1000Research/khmer,ged-lab/khmer,F1000Research/khmer,kdmurray91/khmer,souravsingh/khmer,souravsingh/khmer,kdmurray91/khmer,ged-lab/khmer,ged-lab/khmer