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/status/components/card.js

@@ -0,0 +1,96 @@
+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+
+const hostStyle = {
+  display: 'block',
+  marginTop: '5px',
+  fontSize: '13px'
+};
+
+const getHostname = url => {
+  const parser = document.createElement('a');
+  parser.href = url;
+  return parser.hostname;
+};
+
+class Card extends React.PureComponent {
+
+  renderLink () {
+    const { card } = this.props;
+
+    let image    = '';
+    let provider = card.get('provider_name');
+
+    if (card.get('image')) {
+      image = (
+        <div className='status-card__image'>
+          <img src={card.get('image')} alt={card.get('title')} className='status-card__image-image' />
+        </div>
+      );
+    }
+
+    if (provider.length < 1) {
+      provider = getHostname(card.get('url'))
+    }
+
+    return (
+      <a href={card.get('url')} className='status-card' target='_blank' rel='noopener'>
+        {image}
+
+        <div className='status-card__content'>
+          <strong className='status-card__title' title={card.get('title')}>{card.get('title')}</strong>
+          <p className='status-card__description'>{(card.get('description') || '').substring(0, 50)}</p>
+          <span className='status-card__host' style={hostStyle}>{provider}</span>
+        </div>
+      </a>
+    );
+  }
+
+  renderPhoto () {
+    const { card } = this.props;
+
+    return (
+      <a href={card.get('url')} className='status-card-photo' target='_blank' rel='noopener'>
+        <img src={card.get('url')} alt={card.get('title')} width={card.get('width')} height={card.get('height')} />
+      </a>
+    );
+  }
+
+  renderVideo () {
+    const { card } = this.props;
+    const content  = { __html: card.get('html') };
+
+    return (
+      <div
+        className='status-card-video'
+        dangerouslySetInnerHTML={content}
+      />
+    );
+  }
+
+  render () {
+    const { card } = this.props;
+
+    if (card === null) {
+      return null;
+    }
+
+    switch(card.get('type')) {
+    case 'link':
+      return this.renderLink();
+    case 'photo':
+      return this.renderPhoto();
+    case 'video':
+      return this.renderVideo();
+    case 'rich':
+    default:
+      return null;
+    }
+  }
+}
+
+Card.propTypes = {
+  card: ImmutablePropTypes.map
+};
+
+export default Card;