Add of IR visualizer option
IR visualizer in RubyInstaceConfig
Make IR visualize flag avialable in JRuby module
Merge pull request #892 from komax/komax_add_ir_visualizer_flag

Added flag for IR visualizer
Precision of Time zone is seconds, so express it in seconds directly and avoid needless divisions

* RubySpec "Time#strftime with %z rounds fixed offset to the nearest second"
  can therefore only fail.