Add write options for formats

[ecurtin]

This applies to all output formats, but just as an example it would be nice to be able to write compressed csv from Spark-Bench. To do this in code is df.write.option("compression", "gzip").csv("hdfs:///devnexus/kmeans-data-csv-gzip.csv"). It would be good to have support for generalized write options, not just compression.