Add config to disable acl in fog storage

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 CarrierWave thrives on a large number of [contributors](https://github.com/carrierwaveuploader/carrierwave/contributors),
 and pull requests are very welcome. Before submitting a pull request, please make sure that your changes are well tested.
 
-First, make sure you have `imagemagick` and `ghostscript` installed. You may need `libmagic` as well.
+First, make sure you have `imagemagick`, `ghostscript` and `vips` installed. You may need `libmagic` as well.
 
 Then, you'll need to install the gem dependencies:
 

lib/carrierwave/storage/fog.rb

@@ -510,6 +510,8 @@ def copy_options
         end
 
         def acl_header
+          return {} unless @uploader.fog_acl
+
           case fog_provider
           when 'AWS'
             { 'x-amz-acl' => @uploader.fog_public ? 'public-read' : 'private' }

lib/carrierwave/uploader/configuration.rb

@@ -35,6 +35,7 @@ module Configuration
         add_config :fog_authenticated_url_expiration
         add_config :fog_use_ssl_for_aws
         add_config :fog_aws_accelerate
+        add_config :fog_acl
 
         # Mounting
         add_config :ignore_integrity_errors
@@ -196,6 +197,7 @@ def reset_config
             config.fog_authenticated_url_expiration = 600
             config.fog_use_ssl_for_aws = true
             config.fog_aws_accelerate = false
+            config.fog_acl = true
             config.store_dir = 'uploads'
             config.cache_dir = 'uploads/tmp'
             config.delete_tmp_file_after_storage = true