added thumbnails of crops mentioned on post page

app/views/posts/_single.html.haml

@@ -21,6 +21,14 @@
           :growstuff_markdown
             #{ strip_tags post.body }
 
+        - unless post.crops.empty?
+          .hidden-xs
+            %h3 Crops mentioned in this post
+            - post.crops.each do |c|
+              - unless c.photos.empty?
+                .col-md-2{:style => 'padding-bottom: 6px'}
+                  = render :partial => 'crops/image_with_popover', :locals => { :crop => c }
+      .col-md-11
         - unless defined?(hide_comments)
           .post-comments
             %ul.list-inline