defined default constants for main parameters
added cluster host name configuration
sized down the VM configuration for testing
fixed java package name;
added cluster host ip addresses as command line arguments
simplified function "printHelp"
fixed typo in code example
removed unused attribute "user"
removed expensive test "isStarted" in log append"
renamed attribute "uri" to "host"
added defaults when params are null
refactored imports
renamed attribute "host" to "uri"
added logback sample configuration
configured maven exec plugin to run the app
added option --nb-messages
removed argument "ipHosts"
changed exit code
implemented main execution loop
added START/FINISHED log messages