WebM support

app/views/posts/partials/show/_information.html.erb

@@ -7,7 +7,7 @@
   <% end %>
   <li>
     Size: <%= link_to_if post.visible?, number_to_human_size(post.file_size), post.file_url %>
-    <% if post.is_image? %>
+    <% if post.has_dimensions? %>
       (<%= post.image_width %>x<%= post.image_height %>)
     <% end %>
   </li>

app/views/posts/partials/show/_video.html.erb

@@ -0,0 +1,3 @@
+<%= content_tag(:video, nil, :width => post.image_width, :height => post.image_height, :autoplay => true, :loop => true, :src => post.file_url) %>
+
+<p><%= link_to "Save this video (right click and save)", post.file_url %></p>