Implementation of the method described in the paper "Quality-filtering
vastly improves diversity estimates from Illumina amplicon sequencing"
(http://www.nature.com/nmeth/journal/v10/n1/full/nmeth.2276.html) by
Nicholas A Bokulich,	 Sathish Subramanian,	 Jeremiah J Faith,	 Dirk
Gevers,	 Jeffrey I Gordon, Rob Knight,	 David A Mills	 & J Gregory
Caporaso.