Sparkr 0.4

Sparkr 0.4 introduces changes to interface of the sparkr executable.

• It is now possible to pipe data into sparkr:

    $ echo 9 13 5 17 1 | sparkr
    ▄▆▂█▁
  

• sparkr prints usage information if it is called without any arguments or -h, --help:

  $ sparkr
  
  USAGE:
    sparkr [-h|--help] VALUE,...
  
  EXAMPLES:
    sparkr 1 5 22 13 53
    ▁▁▃▂█
    sparkr 0,30,55,80,33,150
    ▁▂▃▄▂█
    echo 9 13 5 17 1 | sparkr
    ▄▆▂█▁