Allow multiple reference files to be specified on the command line; handle gzipped reference files.
Allow multiple reference files to be specified on the command line; handle gzipped reference files.

pjwilliams/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,tofula/mosesdecoder,tofula/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,tofula/mosesdecoder,moses-smt/mosesdecoder,tofula/mosesdecoder,KonceptGeek/mosesdecoder,pjwilliams/mosesdecoder,tofula/mosesdecoder,KonceptGeek/mosesdecoder,KonceptGeek/mosesdecoder,KonceptGeek/mosesdecoder,pjwilliams/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,alvations/mosesdecoder,moses-smt/mosesdecoder,pjwilliams/mosesdecoder,KonceptGeek/mosesdecoder,KonceptGeek/mosesdecoder,moses-smt/mosesdecoder,pjwilliams/mosesdecoder,tofula/mosesdecoder,alvations/mosesdecoder,pjwilliams/mosesdecoder,pjwilliams/mosesdecoder,tofula/mosesdecoder,tofula/mosesdecoder,pjwilliams/mosesdecoder,emjotde/mosesdecoder_nmt,pjwilliams/mosesdecoder,tofula/mosesdecoder,KonceptGeek/mosesdecoder,tofula/mosesdecoder,KonceptGeek/mosesdecoder,KonceptGeek/mosesdecoder,pjwilliams/mosesdecoder,emjotde/mosesdecoder_nmt,alvations/mosesdecoder,moses-smt/mosesdecoder,tofula/mosesdecoder,KonceptGeek/mosesdecoder,emjotde/mosesdecoder_nmt,alvations/mosesdecoder