updating assets and link for approveme ad

src/_includes/footer.html

@@ -1,7 +1,7 @@
 <footer id="footer" class="footer hidden-print">
   <div class="container text-center">
     <div id="bsap_1298241" class="bsarocks bsap_b1146e3f9fa32a794fc6d2c7be47ece8">
-      <a href="https://www.approveme.me/?utm_source=fontawesome.io&utm_medium=banner&utm_term=Sign%20Documents%20using%20Your%20Wordpress&utm_content=220x65-1a-try-a-free-demo-now&utm_campaign=fontawesome"
+      <a href="https://www.approveme.me/?utm_source=fontawesome.io&utm_medium=banner&utm_term=Sign%20Documents%20using%20Your%20Wordpress&utm_content=220x65-1e-try-a-free-demo-now_2x_bw&utm_campaign=fontawesome"
           title="Sign Documents using Your Wordpress" target="_blank" rel="nofollow"
           onClick="_gaq.push(['_trackEvent', 'Outbound Link', 'approve.me']);">
         <img src="{{ page.relative_path }}assets/img/logo-approveme.png" width="220" height="65" alt="">