Koken Lens if tag and image aspect ratio

gistfile1.txt

		<!-- Display the essay's featured image -->
		<koken:featured_image>
			<!-- Link image to essay -->
			<koken:link title="Read {{ essay.title }}">
				<!-- Display featured image -->
				<koken:if condition="content.width >= content.height" value="true">
				  <koken:img class="horizontal-image" />
				<koken:else>
				  <koken:img class="vertical-image" />
				</koken:if>
			</koken:link>
		</koken:featured_image>