Adding preview environment

Gemfile

@@ -59,7 +59,7 @@ group :test do
 	gem 'database_cleaner'
 end
 
-group :staging, :production do
+group :staging, :production, :preview do
 	gem 'rails_12factor'
 	gem 'capistrano'
 	gem 'rvm-capistrano'

app/helpers/application_helper.rb

@@ -511,7 +511,7 @@ module ApplicationHelper
 	end
 
 	def is_production?
-		Rails.env == 'production'
+		Rails.env == 'production' || Rails.env == 'preview'
 	end
 
 	def is_test?

app/models/translation.rb

@@ -1,3 +0,0 @@
-class Translation < I18n::Backend::ActiveRecord::Translation
-	has_paper_trail
-end

config/assets_cdn.yml

@@ -2,6 +2,12 @@ development:
   enabled: false
   host: bikebike.org
 
+preview:
+  enabled: true
+  host: preview-cdn.bikebike.org
+  protocol: https
+  fallback_protocol: http
+
 production:
   enabled: true
   host: cdn.bikebike.org

config/initializers/carrierwave.rb

@@ -1,5 +1,7 @@
 CarrierWave.configure do |config|
 	if Rails.env == "production"
 		config.asset_host = "https://cdn.bikebike.org"
+	elsif Rails.env == "preview"
+		config.asset_host = "https://preview-cdn.bikebike.org"
 	end
 end