Move post replacement create action to post replacements controller.

config/routes.rb

@@ -30,7 +30,6 @@ Rails.application.routes.draw do
         member do
           get :confirm_delete
           post :expunge
-          post :replace
           post :delete
           post :undelete
           get :confirm_move_favorites
@@ -199,7 +198,7 @@ Rails.application.routes.draw do
   end
   resources :posts do
     resources :events, :only => [:index], :controller => "post_events"
-    resources :replacements, :only => [:index], :controller => "post_replacements"
+    resources :replacements, :only => [:index, :new, :create], :controller => "post_replacements"
     resource :artist_commentary, :only => [:index, :show] do
       collection { put :create_or_update }
       member { put :revert }
@@ -218,7 +217,7 @@ Rails.application.routes.draw do
   end
   resources :post_appeals
   resources :post_flags
-  resources :post_replacements, :only => [:index]
+  resources :post_replacements, :only => [:index, :new, :create]
   resources :post_versions, :only => [:index, :search] do
     member do
       put :undo