Use rails configuration for sounds file path

* Add sounds_path initializer

app/models/sound.rb

@@ -7,7 +7,7 @@ class Sound < ActiveRecord::Base
   validates_presence_of :mime_type
 
   def path
-    "#{Rails.root}/data/sounds/#{sha256}"
+    "#{Rails.configuration.sounds_path}/#{sha256}"
   end
 
   def file=(file)

config/initializers/sounds_path.rb

@@ -0,0 +1 @@
+Scube::Application.config.sounds_path = "#{Rails.root}/data/sounds"

spec/models/sound_spec.rb

@@ -10,8 +10,12 @@ describe Sound do
   it { should validate_presence_of :mime_type }
 
   describe '#path' do
+    it 'starts by the path specified in Rails.configuration.sound_path' do
+      sound.path.should match(/\A#{Rails.configuration.sounds_path}/)
+    end
+
     it 'returns the sound file path based on the SHA256 digest' do
-      sound.path.should == "#{Rails.root}/data/sounds/#{sound.sha256}"
+      sound.path.should == "#{Rails.configuration.sounds_path}/#{sound.sha256}"
     end
   end
 

spec/spec_helper.rb

@@ -11,7 +11,7 @@ Spork.prefork do
     config.mock_with :rspec
     config.use_transactional_fixtures = true
     config.after(:all) do
-      `rm -f #{Rails.root}/data/sounds/*`
+      `rm -f #{Rails.configuration.sounds_path}/*`
     end
   end
 end