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/actions/search.js

@@ -0,0 +1,73 @@
+import api from '../api'
+
+export const SEARCH_CHANGE = 'SEARCH_CHANGE';
+export const SEARCH_CLEAR  = 'SEARCH_CLEAR';
+export const SEARCH_SHOW   = 'SEARCH_SHOW';
+
+export const SEARCH_FETCH_REQUEST = 'SEARCH_FETCH_REQUEST';
+export const SEARCH_FETCH_SUCCESS = 'SEARCH_FETCH_SUCCESS';
+export const SEARCH_FETCH_FAIL    = 'SEARCH_FETCH_FAIL';
+
+export function changeSearch(value) {
+  return {
+    type: SEARCH_CHANGE,
+    value
+  };
+};
+
+export function clearSearch() {
+  return {
+    type: SEARCH_CLEAR
+  };
+};
+
+export function submitSearch() {
+  return (dispatch, getState) => {
+    const value = getState().getIn(['search', 'value']);
+
+    if (value.length === 0) {
+      return;
+    }
+
+    dispatch(fetchSearchRequest());
+
+    api(getState).get('/api/v1/search', {
+      params: {
+        q: value,
+        resolve: true
+      }
+    }).then(response => {
+      dispatch(fetchSearchSuccess(response.data));
+    }).catch(error => {
+      dispatch(fetchSearchFail(error));
+    });
+  };
+};
+
+export function fetchSearchRequest() {
+  return {
+    type: SEARCH_FETCH_REQUEST
+  };
+};
+
+export function fetchSearchSuccess(results) {
+  return {
+    type: SEARCH_FETCH_SUCCESS,
+    results,
+    accounts: results.accounts,
+    statuses: results.statuses
+  };
+};
+
+export function fetchSearchFail(error) {
+  return {
+    type: SEARCH_FETCH_FAIL,
+    error
+  };
+};
+
+export function showSearch() {
+  return {
+    type: SEARCH_SHOW
+  };
+};