Fullscreen / bh / 258

100%

Pull #116

travis-ci

Make `form_for` behave like `link_to` in a nav

Before this commit, using `link_to` inside the block of the `nav`
helper would wrap the `<a>` inside a `<li>` item; however using
`form_for` would **not** wrap the `<form>` inside a `<li>` item.

After this commit, both helpers work in a similar way so the code:

```rhtml
<%= nav class: 'navbar-right' do %>
  <%= link_to 'Setting', settings_path %>
  <%= form_for User.new do |f| %>
    <%= f.submit 'Sign in' %>
  <% end %>
<% end %>
```

now generates the following HTML:

```html
<ul class="navbar-right nav nav-tabs" role="tablist">
  <li>
    <a href="/">Setting</a>
  </li>
  <li>
    <form class="new_user" id="new_user" action="/" accept-charset="UTF-8" method="post">
      <input name="utf8" type="hidden" value="✓">
      <input type="hidden" name="authenticity_token" value="oPy4W/">
      <input type="submit" name="commit" value="Go">
    </form>
  </li>
</ul>
```

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