option to enable compression for hfl-delimited output tap

When gzip (or otherwise) compressing the output of a query using e.g.

```clojure
(with-job-conf {"mapred.output.compress" "true"
                "mapred.output.compression.codec" "org.apache.hadoop.io.compress.GzipCodec"
  (?<- (hfs-delimited output-path) [["Proin"]]))
```

I was not getting compressed output.  With this change adding `:compress true` as an option to `hfs-delimited` sets compression on the schema.

I experimented with other `JobConf` settings and this is what worked.  This may just be a request for comment, is there a way to force compression without directly modify the taps?