Version 1.1

New options:

closeOther: true, //Allow multiple sections to be open(boolean)
activeIndex: false //Active section. The section index(starting from 1)(integer or false)

New files:
css/smk-accordion.less - Less, CSS pre-processor.
js/min/smk-accordion.min.js - plugin minified file

New features:

• Multiple sections open.
• Init multiple accordions with the same class.
• Added activeSection option. No need anymore for .acc_active class.
• Minimum markup. No need anymore for .accordion_in, .acc_head, .acc_content. Just make sure to keep the markup clear like this:

<div class="accordion_selector">
    <!-- Section 1 -->
    <div>
        <div> Section 1 </div>
        <div> <!--TEXT--> </div>
    </div>
    <!-- Section 2 -->
    <div>
        <div> Section 2 </div>
        <div> <!--TEXT--> </div>
    </div>
</div>

Pull Request: #1