add a tag cloud thingy

closes #236

app/controllers/tags_controller.rb

@@ -1,5 +1,10 @@
 class TagsController < ApplicationController
   def index
-    return render :json => Tag.active.all
+    @tags = Tag.all_with_story_counts_for(nil)
+
+    respond_to do |format|
+      format.html { render :action => "index" }
+      format.json { render :json => @tags }
+    end
   end
 end

app/views/tags/index.html.erb

@@ -0,0 +1,13 @@
+<div class="box wide">
+  <div class="legend">
+    Tags
+  </div>
+
+  <% max_size = @tags.map{|t| t.stories_count }.max %>
+  <% @tags.each do |tag| %>
+    <% mod = (max_size.to_f / tag.stories_count.to_f) %>
+    <%= link_to tag.tag, tag_path(tag), :class => tag.css_class,
+      :style => "text-decoration: none; vertical-align: middle; " <<
+      "font-size: #{((52 / (mod + 1)) + 8).ceil}pt; line-height: 1.5em;" %>
+  <% end %>
+</div>

config/routes.rb

@@ -106,6 +106,7 @@ Lobsters::Application.routes.draw do
     get "/filters" => "filters#index"
     post "/filters" => "filters#update"
 
+    get "/tags" => "tags#index"
     get "/tags.json" => "tags#index", :format => "json"
 
     post "/invitations" => "invitations#create"