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/features/public_timeline/index.js

@@ -0,0 +1,96 @@
+import React from 'react';
+import { connect } from 'react-redux';
+import PropTypes from 'prop-types';
+import StatusListContainer from '../ui/containers/status_list_container';
+import Column from '../ui/components/column';
+import {
+  refreshTimeline,
+  updateTimeline,
+  deleteFromTimelines,
+  connectTimeline,
+  disconnectTimeline
+} from '../../actions/timelines';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import ColumnBackButtonSlim from '../../components/column_back_button_slim';
+import createStream from '../../stream';
+
+const messages = defineMessages({
+  title: { id: 'column.public', defaultMessage: 'Federated timeline' }
+});
+
+const mapStateToProps = state => ({
+  hasUnread: state.getIn(['timelines', 'public', 'unread']) > 0,
+  streamingAPIBaseURL: state.getIn(['meta', 'streaming_api_base_url']),
+  accessToken: state.getIn(['meta', 'access_token'])
+});
+
+let subscription;
+
+class PublicTimeline extends React.PureComponent {
+
+  componentDidMount () {
+    const { dispatch, streamingAPIBaseURL, accessToken } = this.props;
+
+    dispatch(refreshTimeline('public'));
+
+    if (typeof subscription !== 'undefined') {
+      return;
+    }
+
+    subscription = createStream(streamingAPIBaseURL, accessToken, 'public', {
+
+      connected () {
+        dispatch(connectTimeline('public'));
+      },
+
+      reconnected () {
+        dispatch(connectTimeline('public'));
+      },
+
+      disconnected () {
+        dispatch(disconnectTimeline('public'));
+      },
+
+      received (data) {
+        switch(data.event) {
+        case 'update':
+          dispatch(updateTimeline('public', JSON.parse(data.payload)));
+          break;
+        case 'delete':
+          dispatch(deleteFromTimelines(data.payload));
+          break;
+        }
+      }
+
+    });
+  }
+
+  componentWillUnmount () {
+    // if (typeof subscription !== 'undefined') {
+    //   subscription.close();
+    //   subscription = null;
+    // }
+  }
+
+  render () {
+    const { intl, hasUnread } = this.props;
+
+    return (
+      <Column icon='globe' active={hasUnread} heading={intl.formatMessage(messages.title)}>
+        <ColumnBackButtonSlim />
+        <StatusListContainer {...this.props} type='public' scrollKey='public_timeline' emptyMessage={<FormattedMessage id='empty_column.public' defaultMessage='There is nothing here! Write something publicly, or manually follow users from other instances to fill it up' />} />
+      </Column>
+    );
+  }
+
+}
+
+PublicTimeline.propTypes = {
+  dispatch: PropTypes.func.isRequired,
+  intl: PropTypes.object.isRequired,
+  streamingAPIBaseURL: PropTypes.string.isRequired,
+  accessToken: PropTypes.string.isRequired,
+  hasUnread: PropTypes.bool
+};
+
+export default connect(mapStateToProps)(injectIntl(PublicTimeline));