Split routes into small files for easier customization (#1852)

config/routes/budget.rb

@@ -0,0 +1,19 @@
+resources :budgets, only: [:show, :index] do
+  resources :groups, controller: "budgets/groups", only: [:show]
+  resources :investments, controller: "budgets/investments", only: [:index, :new, :create, :show, :destroy] do
+    member     { post :vote }
+    collection { get :suggest }
+  end
+
+  resource :ballot, only: :show, controller: "budgets/ballots" do
+    resources :lines, controller: "budgets/ballot/lines", only: [:create, :destroy]
+  end
+
+  resource :results, only: :show, controller: "budgets/results"
+end
+
+scope '/participatory_budget' do
+  resources :spending_proposals, only: [:index, :new, :create, :show, :destroy], path: 'investment_projects' do
+    post :vote, on: :member
+  end
+end