This fixes uploading base64 encoded data to the JSON webservice. For
example:

    echo "NM_003002.2:c.274delT\nXXX:g.1del" | base64 > test.base64
    curl \
      -d 'process=SyntaxChecker' \
      -d 'argument=hg19' \
      --data-urlencode 'data@test.base64' \
      'http://127.0.0.1:8082/submitBatchJob'