Add export and import and batch delete subscribers feature.

lib/e_paper/engine.rb

@@ -65,9 +65,14 @@ module EPaper
                                 :priority=>6,
                                 :active_for_action=>{'admin/e_paper_subscribers'=>'index'},
                                 :available_for => 'managers'
+          context_link 'e_paper.batch_delete_subscribers',
+                                :link_path=>"admin_e_paper_subscribers_batch_delete_subscribers_path" ,
+                                :priority=>7,
+                                :active_for_action=>{'admin/e_paper_subscribers'=>'batch_delete_subscribers'},
+                                :available_for => 'managers'
           context_link 'e_paper.instructions',
                                 :link_path=>"instructions_admin_e_papers_path" ,
-                                :priority=>7,
+                                :priority=>8,
                                 :active_for_action=>{'admin/e_paper'=>'instructions'},
                                 :available_for => 'users'
         end