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/search.js

@@ -0,0 +1,96 @@
+import {
+  SEARCH_CHANGE,
+  SEARCH_CLEAR,
+  SEARCH_FETCH_SUCCESS,
+  SEARCH_SHOW
+} from '../actions/search';
+import { COMPOSE_MENTION, COMPOSE_REPLY } from '../actions/compose';
+import Immutable from 'immutable';
+
+const initialState = Immutable.Map({
+  value: '',
+  submitted: false,
+  hidden: false,
+  results: Immutable.Map()
+});
+
+const normalizeSuggestions = (state, value, accounts, hashtags, statuses) => {
+  let newSuggestions = [];
+
+  if (accounts.length > 0) {
+    newSuggestions.push({
+      title: 'account',
+      items: accounts.map(item => ({
+        type: 'account',
+        id: item.id,
+        value: item.acct
+      }))
+    });
+  }
+
+  if (value.indexOf('@') === -1 && value.indexOf(' ') === -1 || hashtags.length > 0) {
+    let hashtagItems = hashtags.map(item => ({
+      type: 'hashtag',
+      id: item,
+      value: `#${item}`
+    }));
+
+    if (value.indexOf('@') === -1 && value.indexOf(' ') === -1 && !value.startsWith('http://') && !value.startsWith('https://') && hashtags.indexOf(value) === -1) {
+      hashtagItems.unshift({
+        type: 'hashtag',
+        id: value,
+        value: `#${value}`
+      });
+    }
+
+    if (hashtagItems.length > 0) {
+      newSuggestions.push({
+        title: 'hashtag',
+        items: hashtagItems
+      });
+    }
+  }
+
+  if (statuses.length > 0) {
+    newSuggestions.push({
+      title: 'status',
+      items: statuses.map(item => ({
+        type: 'status',
+        id: item.id,
+        value: item.id
+      }))
+    });
+  }
+
+  return state.withMutations(map => {
+    map.set('suggestions', newSuggestions);
+    map.set('loaded_value', value);
+  });
+};
+
+export default function search(state = initialState, action) {
+  switch(action.type) {
+  case SEARCH_CHANGE:
+    return state.set('value', action.value);
+  case SEARCH_CLEAR:
+    return state.withMutations(map => {
+      map.set('value', '');
+      map.set('results', Immutable.Map());
+      map.set('submitted', false);
+      map.set('hidden', false);
+    });
+  case SEARCH_SHOW:
+    return state.set('hidden', false);
+  case COMPOSE_REPLY:
+  case COMPOSE_MENTION:
+    return state.set('hidden', true);
+  case SEARCH_FETCH_SUCCESS:
+    return state.set('results', Immutable.Map({
+      accounts: Immutable.List(action.results.accounts.map(item => item.id)),
+      statuses: Immutable.List(action.results.statuses.map(item => item.id)),
+      hashtags: Immutable.List(action.results.hashtags)
+    })).set('submitted', true);
+  default:
+    return state;
+  }
+};