Added webpack.ProvidePlugin for most used imports

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

app/javascript/gabsocial/features/groups/timeline/index.js

@@ -1,6 +1,3 @@
-import React from 'react';
-import { connect } from 'react-redux';
-import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import StatusListContainer from '../../ui/containers/status_list_container';
 import Column from '../../../components/column';
@@ -22,7 +19,7 @@ const mapStateToProps = (state, props) => ({
 
 export default @connect(mapStateToProps)
 @injectIntl
-class GroupTimeline extends React.PureComponent {
+class GroupTimeline extends PureComponent {
 	static contextTypes = {
 		router: PropTypes.object,
 	};