added user test, basic user methods

config/initializers/danbooru_config.rb

@@ -0,0 +1,10 @@
+require "#{Rails.root}/config/danbooru_default_config"
+require "#{Rails.root}/config/danbooru_local_config"
+
+module Danbooru
+  def config
+    @configuration ||= CustomConfiguration.new
+  end
+  
+  module_function :config
+end