Added post anchors and show post.

when a new post is created, the page is now scrolled to is via its
anchor

created a show post route, and view.

added a post number to post view, with link.

need to change displayed post number from post id, to reply #

app/views/topics/show.html.erb

@@ -13,8 +13,9 @@
     <table>
       <% @posts.each do |post| %>
         <% if !post.user.blank? %>
-          <tr>
+          <tr> 
             <td class="post_author" rowspan="2">
+              <a name="<%= post.id %>"> <%= link_to ("#"+ post.id.to_s ), post %> </a>
               <span class="name"><%= post.user.username %></span>
               <span class="avatar"><%= image_tag post.user.gravatar_url %></span>
               <span class="info smaller">