Update Getting Started to pass instance object instead of constructor to td.object()

[StanleySathler]

Description

The docs - actually, the Getting Started one, available here, next-to-last paragraph - say we can pass a constructor as an argument to td.object() method.

That seems not true anymore, since we currently have this:

// src/object.js
var fakeObject = function (nameOrType, config, argCount) {
  ...
  } else if (_.isFunction(nameOrType)) {
    ensureFunctionIsNotPassed()
  }
  ...
}

Since this part of the tutorial is trying to show the library is smart enough to hunt for any method defined on the function's prototype, I think we should change it to pass an instance rather than the constructor, since the td.constructor() method apparently doesn't hunt for prototyped methods:

describe('MathProblem', function(){
  var subject, createRandomProblem, savesProblem;
  beforeEach(function(){
    createRandomProblem = td.function('createRandomProblem')
    savesProblem = td.object(new SavesProblem())
    subject = new MathProblem(createRandomProblem, savesProblem)
  })
  it('POSTs a random problem', function(){
    // ...
  })
})

What you think, guys? Or am I wrong?