Added webpack.ProvidePlugin for most used imports

Removed imports of React, connect, PropTypes throughout
Removed the "React" in React.Component/PureComponent

app/javascript/gabsocial/containers/timeline_container.js

@@ -1,7 +1,6 @@
 import React, { Fragment } from 'react';
 import ReactDOM from 'react-dom';
 import { Provider } from 'react-redux';
-import PropTypes from 'prop-types';
 import configureStore from '../store/configureStore';
 import { hydrateStore } from '../actions/store';
 import { IntlProvider, addLocaleData } from 'react-intl';
@@ -20,7 +19,7 @@ if (initialState) {
   store.dispatch(hydrateStore(initialState));
 }
 
-export default class TimelineContainer extends React.PureComponent {
+export default class TimelineContainer extends PureComponent {
 
   static propTypes = {
     locale: PropTypes.string.isRequired,