Bootstrap Tooltips

Added Tooltip support.

#### Usage

##### For example in User Profile

*see `<span>`  tag* 
```html
<div class="row">
  <div class="span4 avatared">
    <span rel="tooltip" data-placement="bottom" title="<?php echo __('Change your avatar') ?>">
      <!-- some code -->
    </span>
  </div>
  <div class="span8">
    <!-- some code -->
  </div>
</div>
```

##### Simple usage

```html
<a href="..." rel="tooltip" data-placement="top" title="An tooltip example">Link</a>
```


For more information see [Twitter Bootstrap Tooltips Doc](http://twitter.github.com/bootstrap/javascript.html#tooltips)