Mini-lib to make exported libraries more stubbable w/ e.g. bondjs

stubbable.coffee

###
replace yourlib's:
    module.exports = { foo, bar }
with:
    module.exports = require('./stubbable') { foo, bar }
now when some file does:
    { foo } = require './yourlib'
you can still stub it with:
    yourlib = require './yourlib'
    bond(yourlib._fns, 'foo').return 42
###
_ = require 'underscore'

module.exports = (baseExports) ->
  _fns = {}
  res = { _fns }
  _.each baseExports, (val, name) ->
    if _.isFunction val
      _fns[name] = val
      val = (args...) -> _fns[name] args...
    res[name] = val
  res