add config gem

.gitignore

@@ -11,3 +11,7 @@
 /log/*
 !/log/.keep
 /tmp
+
+config/settings.local.yml
+config/settings/*.local.yml
+config/environments/*.local.yml

Gemfile

@@ -8,3 +8,4 @@ gem 'puma', '~> 2.9.1'
 gem 'capybara'
 gem 'poltergeist', '>= 1.9.0'
 gem 'launchy'
+gem 'config'

Gemfile.lock

@@ -50,6 +50,10 @@ GEM
       xpath (~> 2.0)
     cliver (0.3.2)
     concurrent-ruby (1.0.2)
+    config (1.2.1)
+      activesupport (>= 3.0)
+      deep_merge (~> 1.0, >= 1.0.1)
+    deep_merge (1.0.1)
     erubis (2.7.0)
     faker (1.6.3)
       i18n (~> 0.5)
@@ -130,6 +134,7 @@ PLATFORMS
 DEPENDENCIES
   active_model_serializers
   capybara
+  config
   faker
   launchy
   pg (~> 0.15)
@@ -138,4 +143,4 @@ DEPENDENCIES
   rails (= 4.2.6)
 
 BUNDLED WITH
-   1.11.2
+   1.12.3

config/initializers/config.rb

@@ -0,0 +1,32 @@
+Config.setup do |config|
+  # Name of the constant exposing loaded settings
+  config.const_name = 'Settings'
+
+  # Ability to remove elements of the array set in earlier loaded settings file. For example value: '--'.
+  #
+  # config.knockout_prefix = nil
+
+  # Load environment variables from the `ENV` object and override any settings defined in files.
+  #
+  # config.use_env = false
+
+  # Define ENV variable prefix deciding which variables to load into config.
+  #
+  # config.env_prefix = 'Settings'
+
+  # What string to use as level separator for settings loaded from ENV variables. Default value of '.' works well
+  # with Heroku, but you might want to change it for example for '__' to easy override settings from command line, where
+  # using dots in variable names might not be allowed (eg. Bash).
+  #
+  # config.env_separator = '.'
+
+  # Ability to process variables names:
+  #   * nil  - no change
+  #   * :downcase - convert to lower case
+  #
+  # config.env_converter = nil
+
+  # Parse numeric values as integers instead of strings.
+  #
+  # config.env_parse_values = false
+end