upgrade facebook messenger gem (#159)

- carrierwave local config
- upgrade facebook messenger gem to support facebook graph api 4.0

config/initializers/carrierwave.rb

@@ -1,31 +1,37 @@
 CarrierWave.configure do |config|
-  config.storage    = :aws
-  config.aws_bucket = ENV['S3_BUCKET_NAME']
-  config.aws_acl    = 'authenticated-read'
-
-  # Optionally define an asset host for configurations that are fronted by a
-  # content host, such as CloudFront.
-  #config.asset_host = 'http://example.com'
-
-  # The maximum period for authenticated_urls is only 7 days.
-  config.aws_authenticated_url_expiration = 60 * 60 * 24 * 7
-
-  # Set custom options such as cache control to leverage browser caching
-  config.aws_attributes = {
-    expires: 1.week.from_now.httpdate,
-    cache_control: 'max-age=604800'
-  }
-
-  config.aws_credentials = {
-    access_key_id:     ENV['AWS_ACCESS_KEY_ID'],
-    secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
-    region:            ENV['AWS_REGION'] # Required
-  }
-
-  # Optional: Signing of download urls, e.g. for serving private content through
-  # CloudFront. Be sure you have the `cloudfront-signer` gem installed and
-  # configured:
-  # config.aws_signer = -> (unsigned_url, options) do
-  #   Aws::CF::Signer.sign_url(unsigned_url, options)
-  # end
+  config.storage = :file
+end
+
+if Rails.env.production?
+  CarrierWave.configure do |config|
+    config.storage    = :aws
+    config.aws_bucket = ENV['S3_BUCKET_NAME']
+    config.aws_acl    = 'authenticated-read'
+
+    # Optionally define an asset host for configurations that are fronted by a
+    # content host, such as CloudFront.
+    #config.asset_host = 'http://example.com'
+
+    # The maximum period for authenticated_urls is only 7 days.
+    config.aws_authenticated_url_expiration = 60 * 60 * 24 * 7
+
+    # Set custom options such as cache control to leverage browser caching
+    config.aws_attributes = {
+      expires: 1.week.from_now.httpdate,
+      cache_control: 'max-age=604800'
+    }
+
+    config.aws_credentials = {
+      access_key_id:     ENV['AWS_ACCESS_KEY_ID'],
+      secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
+      region:            ENV['AWS_REGION'] # Required
+    }
+
+    # Optional: Signing of download urls, e.g. for serving private content through
+    # CloudFront. Be sure you have the `cloudfront-signer` gem installed and
+    # configured:
+    # config.aws_signer = -> (unsigned_url, options) do
+    #   Aws::CF::Signer.sign_url(unsigned_url, options)
+    # end
+  end
 end