Kill trailing whitespace in ruby files

app/controllers/posts_controller.rb

@@ -6,7 +6,7 @@ class PostsController < ApplicationController
   rescue_from Post::SearchError, :with => :rescue_exception
   rescue_from ActiveRecord::StatementInvalid, :with => :rescue_exception
   rescue_from ActiveRecord::RecordNotFound, :with => :rescue_exception
-  
+
   def index
     @post_set = PostSets::Post.new(tag_query, params[:page], params[:limit])
     @posts = @post_set.posts
@@ -14,14 +14,14 @@ class PostsController < ApplicationController
       format.atom
     end
   end
-  
+
   def show
     @post = Post.find(params[:id])
     @post_flag = PostFlag.new(:post_id => @post.id)
     @post_appeal = PostAppeal.new(:post_id => @post.id)
     respond_with(@post)
   end
-  
+
   def show_seq
     context = PostSearchContext.new(params)
     if context.post_id
@@ -30,14 +30,14 @@ class PostsController < ApplicationController
       redirect_to(post_path(params[:id], :tags => params[:tags]))
     end
   end
-  
+
   def update
     @post = Post.find(params[:id])
 
     if Danbooru.config.can_user_see_post?(CurrentUser.user, @post)
       @post.update_attributes(params[:post], :as => CurrentUser.role)
     end
-    
+
     respond_with(@post) do |format|
       format.html do
         if @post.errors.any?
@@ -49,13 +49,13 @@ class PostsController < ApplicationController
           redirect_to post_path(@post)
         end
       end
-      
+
       format.json do
         render :json => @post.to_json
       end
     end
   end
-  
+
   def revert
     @post = Post.find(params[:id])
     @version = PostVersion.find(params[:version_id])