CRUNCH-414: CSVLineReader-Threshold-Logic

JIRA: https://issues.apache.org/jira/browse/CRUNCH-414
Ok, got it, I also modified bufferSize to match this pattern,
{code}    bufferSize = this.configuration.getInt(CSVFileSource.CSV_BUFFER_SIZE, -1);
    if (bufferSize < 0) {
      bufferSize = CSVLineReader.DEFAULT_BUFFER_SIZE;
    }{code}