change the default way to config AWS for carrierwave + fix issue #299

lib/generators/locomotive/install/templates/carrierwave.rb

@@ -10,11 +10,14 @@ CarrierWave.configure do |config|
 
   when :production
     # the following configuration works for Amazon S3
-    config.storage              = :s3
-    config.s3_access_key_id     = ENV['S3_KEY_ID']
-    config.s3_secret_access_key = ENV['S3_SECRET_KEY']
-    config.s3_bucket            = ENV['S3_BUCKET']
-    # config.s3_cname           = ENV['S3_CNAME'] # optional
+    config.storage          = :fog
+    config.fog_credentials  = {
+      :provider                 => 'AWS',
+      :aws_access_key_id        => ENV['S3_KEY_ID'],
+      :aws_secret_access_key    => ENV['S3_SECRET_KEY'],
+      :region                   => 'us-east-1'
+    }
+    config.fog_directory    = ENV['S3_BUCKET']
 
   else
     # settings for the local filesystem

lib/locomotive/carrierwave/base.rb

@@ -3,11 +3,7 @@ module CarrierWave
     class Base
 
       def to_liquid
-        {
-          :url      => self.url,
-          :filename => (File.basename(self.url) rescue ''),
-          :size     => self.size
-        }.stringify_keys
+        Locomotive::Liquid::Drops::Uploader.new(self)
       end
 
     end

lib/locomotive/liquid/drops/uploader.rb

@@ -0,0 +1,15 @@
+module Locomotive
+  module Liquid
+    module Drops
+      class Uploader < Base
+
+        delegate :url, :size, :to => '_source'
+
+        def filename
+          File.basename(self._source.url)
+        end
+
+      end
+    end
+  end
+end