Added functional Olark with overriding styles

<h2>Olark Implementation</h2>

<ul>
<li>
Added olark.js, the provided script to get Olark running
</li>
<li>
Added jquery to allow olark popup when clicking the Help button in side bar
</li>
<li>
Added overriding stylesheet to put in custom styles into Olark box
</li>
</ul>