Updated text for the file types that our unpack function accepts.
Updated text for the file types that our unpack function accepts.

teharrison/MG-RAST,wilke/MG-RAST,teharrison/MG-RAST,paczian/MG-RAST,wilke/MG-RAST,MG-RAST/MG-RAST,paczian/MG-RAST,MG-RAST/MG-RAST,teharrison/MG-RAST,wilke/MG-RAST,MG-RAST/MG-RAST,MG-RAST/MG-RAST,paczian/MG-RAST,teharrison/MG-RAST,MG-RAST/MG-RAST,wilke/MG-RAST,wilke/MG-RAST,paczian/MG-RAST,paczian/MG-RAST,wilke/MG-RAST,teharrison/MG-RAST,wilke/MG-RAST,paczian/MG-RAST,teharrison/MG-RAST