replace octal literals with `parseInt(NNN, 8)`

  1. octal literals are deprecated: [MDN](https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Global_Objects/parseInt#ECMAScript_5_removes_octal_interpretation), [MSDN](http://msdn.microsoft.com/en-us/library/tabhx776(v=vs.90).aspx)
  2. there is the only option to work with ES6 harmony in node: `--use-strict`

PS I've added `.gitignore`, but I'll remove it, if it's necessary.