add most viewed posts page

app/presenters/post_set_presenters/most_viewed.rb

@@ -0,0 +1,54 @@
+module PostSetPresenters
+  class MostViewed < Base
+    attr_accessor :post_set, :tag_set_presenter
+    delegate :posts, :date, :to => :post_set
+
+    def initialize(post_set)
+      @post_set = post_set
+    end
+
+    def prev_day
+      date - 1.day
+    end
+
+    def next_day
+      date + 1.day
+    end
+
+    def nav_links_for_scale(template)
+      html = []
+      html << '<span class="period">'
+      html << template.link_to(
+        "< Back".html_safe,
+        template.viewed_explore_posts_path(
+          :date => prev_day
+        ),
+        :rel => "prev"
+      )
+      html << template.link_to(
+        date.to_s,
+        template.viewed_explore_posts_path(
+          :date => date
+        ),
+        :class => "desc"
+      )
+      html << template.link_to(
+        "Next >".html_safe,
+        template.viewed_explore_posts_path(
+          :date => next_day
+        ),
+        :rel => "next"
+      )
+      html << '</span>'
+      html.join("\n").html_safe
+    end
+
+    def nav_links(template)
+      html =  []
+      html << '<p id="popular-nav-links">'
+      html << nav_links_for_scale(template)
+      html << '</p>'
+      html.join("\n").html_safe
+    end
+  end
+end