Added a draft logo and powered by uabgrid icon

Some logo exploration and icon work from uabtheme project applied to mw.

The docs logo is sized according to the uab theme requirements.

Created a powered by uabgrid icon to display at the base of the page to sit
alongside mw and cc logos.  The icon is hand inserted into the page
and not yet useing the php lookup function as the other icons do, since
i don't know how this variable works yet.

skins/UabVector.php

@@ -582,6 +582,7 @@ class UabVectorTemplate extends QuickTemplate {
 			<ul id="footer-icons" class="noprint">
 				<?php if ( $this->data['poweredbyico'] ): ?>
 				<li id="footer-icon-poweredby"><?php $this->html( 'poweredbyico' ) ?></li>
+				   <li id="footer-icon-poweredby"><a href="http://dev.uabgrid.uab.edu"><img width="88" height="31" alt="Powered by UABgrid" src="/mediawiki/skins/uabvector/powered-by-uabgrid.png"></a></li>
 				<?php endif; ?>
 				<?php if ( $this->data['copyrightico'] ): ?>
 				<li id="footer-icon-copyright"><?php $this->html( 'copyrightico' ) ?></li>