Fix coding standards in application

app/controllers/api/application_controller.rb

@@ -1,4 +1,5 @@
-class API::ApplicationController < ApplicationController
+module API
+  class ApplicationController < ::ApplicationController
     skip_before_filter :verify_authenticity_token
     skip_before_filter :authenticate!, only: [:cor_preflight]
 
@@ -24,3 +25,4 @@ class API::ApplicationController < ApplicationController
       head :unauthorized if current_user.nil?
     end
   end
+end

app/controllers/api/playlists_controller.rb

@@ -1,4 +1,5 @@
-class API::PlaylistsController < API::ApplicationController
+module API
+  class PlaylistsController < ApplicationController
     respond_to :json
 
     def index
@@ -10,3 +11,4 @@ class API::PlaylistsController < API::ApplicationController
       @playlist.save
     end
   end
+end

app/controllers/api/sessions_controller.rb

@@ -1,10 +1,11 @@
-class API::SessionsController < API::ApplicationController
+module API
+  class SessionsController < ApplicationController
     skip_before_filter :authenticate!, only: [:create]
 
     def create
       user = User.find_by_email(params[:session][:email])
 
-    if !user.try(:authenticate?, params[:session][:password])
+      unless user.try(:authenticate?, params[:session][:password])
         return render json: '', status: :not_found
       end
 
@@ -12,3 +13,4 @@ class API::SessionsController < API::ApplicationController
       self.current_user = @user
     end
   end
+end

app/controllers/api/sounds_controller.rb

@@ -1,7 +1,9 @@
-class API::SoundsController < API::ApplicationController
+module API
+  class SoundsController < ApplicationController
     # FIXME: add some tests!
     def show
       sound = Sound.find params[:id]
       send_file sound.path, type: sound.mime_type
     end
   end
+end

app/controllers/api/tracks_controller.rb

@@ -1,5 +1,7 @@
-class API::TracksController < API::ApplicationController
+module API
+  class TracksController < ApplicationController
     def index
       @tracks = Track.all
     end
   end
+end