Browser-friendly inheritance fully compatible with standard node.js
  [inherits](http://nodejs.org/api/util.html#util_util_inherits_constructor_superconstructor).
  
  This package exports standard `inherits` from node.js `util` module in
  node environment, but also provides alternative browser-friendly
  implementation through [browser
  field](https://gist.github.com/shtylman/4339901). Alternative
  implementation is a literal copy of standard one located in standalone
  module to avoid requiring of `util`. It also has a shim for old
  browsers with no `Object.create` support.
  
  While keeping you sure you are using standard `inherits`
  implementation in node.js environment, it allows bundlers such as
  [browserify](https://github.com/substack/node-browserify) to not
  include full `util` package to your client code if all you need is
  just `inherits` function. It worth, because browser shim for `util`
  package is large and `inherits` is often the single function you need
  from it.
  
  It's recommended to use this package instead of
  `require('util').inherits` for any code that has chances to be used
  not only in node.js but in browser too.
  
  ## usage
  
  ```js
  var inherits = require('inherits');
  // then use exactly as the standard one
  ```
  
  ## note on version ~1.0
  
  Version ~1.0 had completely different motivation and is not compatible
  neither with 2.0 nor with standard node.js `inherits`.
  
  If you are using version ~1.0 and planning to switch to ~2.0, be
  careful:
  
  * new version uses `super_` instead of `super` for referencing
    superclass
  * new version overwrites current prototype while old one preserves any
    existing fields on it