Closes #210. Making sure maxLatency is not set to -1 by default. This ti...

...cket will be followed on by an API change to get rid of StoreConfig and use BatchWriterConfig and BatchScanConfig
I know with our testing or 5~10 second latencies we noticed a drop in ingest times.  To be fair this wasn't thoroughly investigated, so it should be taken with a grain of salt.

With this code however, it would be nice to either defend the reasoning behind choosing specific number or to default to the values used by the default underlying implementation (i.e. BatchWriterConfig).