Added join requests to Groups

• Added:
- join requests to Groups
- redux actions, reducers
- controller and functionality for fetching join requests, accepting, rejecting join requests

config/routes.rb

@@ -440,6 +440,11 @@ Rails.application.routes.draw do
         resources :relationships, only: :index, controller: 'groups/relationships'
         resource :accounts, only: [:show, :create, :update, :destroy], controller: 'groups/accounts'
         resource :removed_accounts, only: [:show, :create, :destroy], controller: 'groups/removed_accounts'
+        resource :join_requests, only: [:show, :create], controller: 'groups/requests'
+        
+        post '/join_requests/approve', to: 'groups/requests#approve_request'
+        delete '/join_requests/reject', to: 'groups/requests#reject_request'
+
         resource :pin, only: :create, controller: 'groups/pins'
         post :unpin, to: 'groups/pins#destroy'
       end