Topbar optimizations

Created by: nikku

Fixes form related stuff in .topbar

• Requires .search-form to be attached to the search form and thus allows other forms to be present in drop-down without applying the search form style to them
• Allows other elements than <ul> to represent the drop-down menu, if they have a .menu-dropdown class.The following html snipped would be a valid sub-menu:

<ul class="nav secondary-nav">
    <li class="menu">
        <a href="#" class="menu">Login</a>
        <div class="menu-dropdown">
            <form class="form-stacked" action="#" method="post">
                <fieldset>
                    <div class="clearfix">
                        <label for="name">User name</label>
                        <div class="input">
                            <input type="text" class="medium" id="name" name="name">
                        </div>
                    </div>
                    <!-- other form elements -->
                </fieldset>

                <p>Some notes on login</p>
                <!-- other related stuff -->
            </form>
        </div>
    </li>
</ul>