Update pagination classes moving into a module

lib/jekyll/generators/pagination.rb

@@ -1,5 +1,5 @@
 module Jekyll
-
+  module Generators
     class Pagination < Generator
       # This generator is safe from arbitrary code execution.
       safe true
@@ -51,6 +51,7 @@ module Jekyll
           format.sub(':num', num_page.to_s)
         end
     end
+  end
 
   class Pager
     attr_reader :page, :per_page, :posts, :total_posts, :total_pages, :previous_page, :next_page
@@ -115,5 +116,4 @@ module Jekyll
       }
     end
   end
-
 end