A little more pollish for the Todo Tutorial

[Tim-Blokdijk]

• Double space line endings, as backslash line endings are not parsed right on the site.
• Extra whitespace with code indenting removed.
• Indenting in chapter 2 removed.
• Triple asterisks removed.

Current problems:
Chapter 7
"Notice that as you click each link the page reloads."
Reconfirming that the links created don't actually fully reload the page, on Firefox and Chrome.
It's this code in footer.rb, that won't work:

class Footer < HyperComponent
  def link_item(path)
    A(href: "/#{path}", style: { marginRight: 10 }) { path.camelize }
  end
  render(DIV) do
    link_item(:all)
    link_item(:active)
    link_item(:completed)
  end
end

Chapter 11
At row 840

Firefox has difficulty rendering the checkbox with the provided css.