드롭다운(Dropdowns)

<div class="dropdown"> // col-md-* 지정 가능
	<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
		Dropdown
		<span class="caret"></span>
	</button>
	<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1"> // dropdown-menu-right 지정 가능
		<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Action</a></li>
		<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Another action</a></li>
		<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Something else here</a></li>
		<li role="presentation" class="divider"></li>
		<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Separated link</a></li>
	</ul>
</div>

* 메뉴 헤더

<li role="presentation" class="dropdown-header">Dropdown header</li>

* 주석 처리

<li role="presentation" class="disabled"><a role="menuitem" tabindex="-1" href="#">Disabled link</a></li>