Problem with Angular2 TodoMVC

Confirmed in Cypress 0.19.4 and 0.20.0

Cannot type "enter" from the test into Angular2 example

```js
// Angular2
const url = 'http://todomvc.com/examples/angular2/'
context('New Todo', () => {
beforeEach(() => {
cy.visit(url)
})

const firstTodo = 'Learn Cypress'

it('adds 1 todo', () => {
cy.get('.new-todo').type(firstTodo).type('{enter}')
cy.get('.todo-list li')
.first()
.find('label').should('contain', firstTodo)
})
})
```
The "Learn Cypress" text appears, but the Enter does nothing

Start with the provided Cypress test and reproduce it against the Angular2 TodoMVC URL using the reported Cypress versions. Trace why typing {enter} does not create the todo; done is when the test passes and the new todo appears in .todo-list with the expected text.

Written by the indexing model from the issue text.