Replace sprockets/browserify with Webpack (#2617)

* Replace browserify with webpack

* Add react-intl-translations-manager

* Do not minify in development, add offline-plugin for ServiceWorker background cache updates

* Adjust tests and dependencies

* Fix production deployments

* Fix tests

* More optimizations

* Improve travis cache for npm stuff

* Re-run travis

* Add back support for custom.scss as before

* Remove offline-plugin and babili

* Fix issue with Immutable.List().unshift(...values) not working as expected

* Make travis load schema instead of running all migrations in sequence

* Fix missing React import in WarningContainer. Optimize rendering performance by using ImmutablePureComponent instead of
React.PureComponent. ImmutablePureComponent uses Immutable.is() to compare props. Replace dynamic callback bindings in
<UI />

* Add react definitions to places that use JSX

* Add Procfile.dev for running rails, webpack and streaming API at the same time

app/javascript/mastodon/reducers/notifications.js

@@ -0,0 +1,104 @@
+import {
+  NOTIFICATIONS_UPDATE,
+  NOTIFICATIONS_REFRESH_SUCCESS,
+  NOTIFICATIONS_EXPAND_SUCCESS,
+  NOTIFICATIONS_REFRESH_REQUEST,
+  NOTIFICATIONS_EXPAND_REQUEST,
+  NOTIFICATIONS_REFRESH_FAIL,
+  NOTIFICATIONS_EXPAND_FAIL,
+  NOTIFICATIONS_CLEAR,
+  NOTIFICATIONS_SCROLL_TOP
+} from '../actions/notifications';
+import { ACCOUNT_BLOCK_SUCCESS } from '../actions/accounts';
+import Immutable from 'immutable';
+
+const initialState = Immutable.Map({
+  items: Immutable.List(),
+  next: null,
+  top: true,
+  unread: 0,
+  loaded: false,
+  isLoading: true
+});
+
+const notificationToMap = notification => Immutable.Map({
+  id: notification.id,
+  type: notification.type,
+  account: notification.account.id,
+  status: notification.status ? notification.status.id : null
+});
+
+const normalizeNotification = (state, notification) => {
+  if (!state.get('top')) {
+    state = state.update('unread', unread => unread + 1);
+  }
+
+  return state.update('items', list => list.unshift(notificationToMap(notification)));
+};
+
+const normalizeNotifications = (state, notifications, next) => {
+  let items    = Immutable.List();
+  const loaded = state.get('loaded');
+
+  notifications.forEach((n, i) => {
+    items = items.set(i, notificationToMap(n));
+  });
+
+  if (state.get('next') === null) {
+    state = state.set('next', next);
+  }
+
+  return state
+    .update('items', list => loaded ? items.concat(list) : list.concat(items))
+    .set('loaded', true)
+    .set('isLoading', false);
+};
+
+const appendNormalizedNotifications = (state, notifications, next) => {
+  let items = Immutable.List();
+
+  notifications.forEach((n, i) => {
+    items = items.set(i, notificationToMap(n));
+  });
+
+  return state
+    .update('items', list => list.concat(items))
+    .set('next', next)
+    .set('isLoading', false);
+};
+
+const filterNotifications = (state, relationship) => {
+  return state.update('items', list => list.filterNot(item => item.get('account') === relationship.id));
+};
+
+const updateTop = (state, top) => {
+  if (top) {
+    state = state.set('unread', 0);
+  }
+
+  return state.set('top', top);
+};
+
+export default function notifications(state = initialState, action) {
+  switch(action.type) {
+  case NOTIFICATIONS_REFRESH_REQUEST:
+  case NOTIFICATIONS_EXPAND_REQUEST:
+  case NOTIFICATIONS_REFRESH_FAIL:
+  case NOTIFICATIONS_EXPAND_FAIL:
+    return state.set('isLoading', true);
+  case NOTIFICATIONS_SCROLL_TOP:
+    return updateTop(state, action.top);
+  case NOTIFICATIONS_UPDATE:
+    return normalizeNotification(state, action.notification);
+  case NOTIFICATIONS_REFRESH_SUCCESS:
+    return normalizeNotifications(state, action.notifications, action.next);
+  case NOTIFICATIONS_EXPAND_SUCCESS:
+    return appendNormalizedNotifications(state, action.notifications, action.next);
+  case ACCOUNT_BLOCK_SUCCESS:
+    return filterNotifications(state, action.relationship);
+  case NOTIFICATIONS_CLEAR:
+    return state.set('items', Immutable.List()).set('next', null);
+  default:
+    return state;
+  }
+};