code: func (F *Frisby) AfterText(foo AfterTextFunc) *Frisby {
  	text, err := F.Resp.Text()
  	foo(F, text, err)
  	return F
  }
docs: // AfterText allows you to write your own functions for inspecting the body of the response.
  // You are also provided with the Frisby object.
  //
  // The function signiture is AfterTextFunc
  //  type AfterTextFunc func(F *Frisby, text string, err error)
  //