Added feature to create header in side menu

Feature
-
If side menus `<nav>` or `<aside>` has `title` attribute then a `<header>` element in prepended and the title value is set as header title in `<h1>`

If side menu is defined like : `<nav title="Hello">`, then it will be changed like this:
```
<nav>
  <header class="header">
    <h1>Hello</h1>
  </header>
  ...

```

Added code to `appframework.ui.js` and updated `index.html` with this feature

![screen shot 2014-04-06 at 10 37 31 pm](https://cloud.githubusercontent.com/assets/1414842/2627891/fa9785ba-be16-11e3-969a-45ffe09706f6.png)