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/reports.js

@@ -0,0 +1,72 @@
+import api from '../api';
+
+export const REPORT_INIT   = 'REPORT_INIT';
+export const REPORT_CANCEL = 'REPORT_CANCEL';
+
+export const REPORT_SUBMIT_REQUEST = 'REPORT_SUBMIT_REQUEST';
+export const REPORT_SUBMIT_SUCCESS = 'REPORT_SUBMIT_SUCCESS';
+export const REPORT_SUBMIT_FAIL    = 'REPORT_SUBMIT_FAIL';
+
+export const REPORT_STATUS_TOGGLE  = 'REPORT_STATUS_TOGGLE';
+export const REPORT_COMMENT_CHANGE = 'REPORT_COMMENT_CHANGE';
+
+export function initReport(account, status) {
+  return {
+    type: REPORT_INIT,
+    account,
+    status
+  };
+};
+
+export function cancelReport() {
+  return {
+    type: REPORT_CANCEL
+  };
+};
+
+export function toggleStatusReport(statusId, checked) {
+  return {
+    type: REPORT_STATUS_TOGGLE,
+    statusId,
+    checked,
+  };
+};
+
+export function submitReport() {
+  return (dispatch, getState) => {
+    dispatch(submitReportRequest());
+
+    api(getState).post('/api/v1/reports', {
+      account_id: getState().getIn(['reports', 'new', 'account_id']),
+      status_ids: getState().getIn(['reports', 'new', 'status_ids']),
+      comment: getState().getIn(['reports', 'new', 'comment'])
+    }).then(response => dispatch(submitReportSuccess(response.data))).catch(error => dispatch(submitReportFail(error)));
+  };
+};
+
+export function submitReportRequest() {
+  return {
+    type: REPORT_SUBMIT_REQUEST
+  };
+};
+
+export function submitReportSuccess(report) {
+  return {
+    type: REPORT_SUBMIT_SUCCESS,
+    report
+  };
+};
+
+export function submitReportFail(error) {
+  return {
+    type: REPORT_SUBMIT_FAIL,
+    error
+  };
+};
+
+export function changeReportComment(comment) {
+  return {
+    type: REPORT_COMMENT_CHANGE,
+    comment
+  };
+};