Allow undeleting comments

app/views/comments/partials/show/_comment.html.erb

@@ -25,7 +25,11 @@
           <% if @post || @posts %>
             <li><%= link_to "Reply", new_comment_path(:post_id => comment.post_id), :class => "reply-link", "data-comment-id" => comment.id %></li>
             <% if comment.editable_by?(CurrentUser.user) %>
-              <li><%= link_to "Delete", comment_path(comment.id), :data => {:confirm => "Are you sure you want to delete this comment?"}, :method => :delete, :remote => true %></li>
+              <% if comment.is_deleted? %>
+                <li><%= link_to "Undelete", undelete_comment_path(comment.id), :method => :post, :remote => true %></li>
+              <% else %>
+                <li><%= link_to "Delete", comment_path(comment.id), :data => {:confirm => "Are you sure you want to delete this comment?"}, :method => :delete, :remote => true %></li>
+              <% end %>
               <li><%= link_to "Edit", edit_comment_path(comment.id), :id => "edit_comment_link_#{comment.id}", :class => "edit_comment_link" %></li>
             <% end %>
             <li id="comment-vote-up-link-for-<%= comment.id %>"><%= link_to "Vote up", comment_votes_path(:comment_id => comment.id, :score => "up"), :method => :post, :remote => true %></li>

app/views/comments/undelete.js.erb

@@ -0,0 +1 @@
+location.reload();