Observer configuration in fluo.properties needs way to handle commas in values

[mikewalch]

While trying to run the phrasecount application on an EC2 cluster with multiple zookeepers setup, my attempt to call fluo init failed because my fluo.properties file was invalid. This was due to an observer being configured with a zookeeper connection string that had commas in it (due to multiple servers). The commas caused an error to be thrown and stopped initialization.

This script creates the fluo.properties file:

https://github.com/fluo-io/phrasecount/blob/master/bin/configure.sh#L39