post sets: eliminate PostSets::Base class.

app/logical/post_sets/base.rb

@@ -1,39 +0,0 @@
-module PostSets
-  class Base
-    def raw
-      false
-    end
-
-    def wiki_page
-      nil
-    end
-
-    def artist
-      nil
-    end
-
-    def is_single_tag?
-      false
-    end
-
-    def tag_string
-      nil
-    end
-
-    def unknown_post_count?
-      false
-    end
-
-    def use_sequential_paginator?
-      false
-    end
-
-    def best_post
-      nil
-    end
-
-    def presenter
-      raise NotImplementedError
-    end
-  end
-end

app/logical/post_sets/post.rb

@@ -1,5 +1,5 @@
 module PostSets
-  class Post < PostSets::Base
+  class Post
     MAX_PER_PAGE = 200
     attr_reader :tag_array, :page, :raw, :random, :post_count, :format
 

app/logical/post_sets/search_error.rb

@@ -1,4 +0,0 @@
-module PostSets
-  class SearchError < StandardError
-  end
-end