Merge pull request #10 from cdimartino/patch-1

Command line args need to be cast to_i
Bump version to 0.3.9
add block to default scope
Merge pull request #12 from rubyrider/master

added block to default scope
Set Ruby version to 2.1.4
Merge remote-tracking branch 'original/master' into branches/fix_losing_punches_bug

* original/master:
  Set Ruby version to 2.1.4
  add block to default scope
  Bump version to 0.3.9