Address @nilsding's review comments

- Fix types on legacy attachment migrations
- Restore Action Mailer setup for development env
- Use `Hash#dig` in CarrierWave initializer

config/environments/development.rb

@@ -29,8 +29,14 @@ Rails.application.configure do
   # Action Mailer Setup
   # if you want to test sending mails locally, uncomment the line below and comment the :sendmail line
   # config.action_mailer.delivery_method = :letter_opener
+  if ENV["mailcatcher"] == "yes"
     config.action_mailer.delivery_method = :smtp
     config.action_mailer.smtp_settings = { :address => "localhost", :port => 1025 }
+  elsif ENV["letteropener"] == "yes"
+    config.action_mailer.delivery_method = :letter_opener
+  else
+    config.action_mailer.delivery_method = :sendmail
+  end
 
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false

config/initializers/25_carrierwave.rb

@@ -6,7 +6,7 @@ CarrierWave.configure do |config|
   config.fog_directory = "/system"
 
   unless APP_CONFIG["fog"].nil?
-    config.fog_credentials = APP_CONFIG["fog"]["credentials"] unless APP_CONFIG["fog"]["credentials"].nil?
-    config.fog_directory = APP_CONFIG["fog"]["directory"] unless APP_CONFIG["fog"]["directory"].nil?
+    config.fog_credentials = APP_CONFIG.dig("fog", "credentials") unless APP_CONFIG.dig("fog", "credentials").nil?
+    config.fog_directory = APP_CONFIG.dig("fog", "directory") unless APP_CONFIG.dig("fog", "directory").nil?
   end
 end

db/migrate/20141229085904_add_attachment_profile_picture_to_users.rb

@@ -3,7 +3,7 @@ class AddAttachmentProfilePictureToUsers < ActiveRecord::Migration[4.2]
     change_table :users do |t|
       t.string :profile_picture_file_name
       t.string :profile_picture_content_type
-      t.bigint :profile_picture_file_size
+      t.integer :profile_picture_file_size
       t.datetime :profile_picture_updated_at
     end
   end

db/migrate/20150508144336_add_attachment_profile_header_to_users.rb

@@ -3,7 +3,7 @@ class AddAttachmentProfileHeaderToUsers < ActiveRecord::Migration[4.2]
     change_table :users do |t|
       t.string :profile_header_file_name
       t.string :profile_header_content_type
-      t.bigint :profile_header_file_size
+      t.integer :profile_header_file_size
       t.datetime :profile_header_updated_at
       t.boolean :profile_header_processing
       t.integer :crop_h_x