Change app.config.version to an integer instead of string

assets/javascripts/app/config.coffee.erb

@@ -10,4 +10,4 @@ app.config =
   production_host: 'devdocs.io'
   search_param: 'q'
   sentry_dsn: '<%= App.sentry_dsn %>'
-  version: '<%= Time.now.to_i %>'
+  version: <%= Time.now.to_i %>

assets/javascripts/app/db.coffee

@@ -280,4 +280,4 @@ class app.DB
     app.settings.get('schema')
 
   appVersion: ->
-    if app.config.env is 'production' then parseInt(app.config.version, 10) else Math.floor(Date.now() / 1000)
+    if app.config.env is 'production' then app.config.version else Math.floor(Date.now() / 1000)