Add aria landmark roles

view/partial/footer.html

@@ -1,5 +1,5 @@
 <footer>
-	<div class="footer">
+	<div class="footer" role="contentinfo">
 		<div class="container">
 			<ul class="pull-right crunch-bottom">
 				<li>

view/partial/header.html

@@ -1,5 +1,5 @@
 <header>
-	<div class="header">
+	<div role="banner" class="header">
 		<div class="container">
 			<h1><a href="/">pa11y</a> - your automated accessibility testing pal</h1>
 		</div>

view/partial/tasks.html

@@ -7,7 +7,7 @@
 		</a>
 	</li>
 	{{#tasks}}
-		<li class="col-md-4 col-sm-6 task-card">
+		<li class="col-md-4 col-sm-6 task-card" role="article">
 			<a class="well task-card-link crunch-bottom" title="Task details for {{simplify-url url}}" href="/{{id}}">
 				<p class="h3">{{simplify-url url}}</p>
 				<p class="h5">({{standard}})</p>