Add explicit "load more" link to the bottom of StatusList and notifications

app/assets/javascripts/components/components/load_more.jsx

@@ -0,0 +1,21 @@
+import { FormattedMessage } from 'react-intl';
+
+const loadMoreStyle = {
+  display: 'block',
+  color: '#616b86',
+  textAlign: 'center',
+  padding: '15px',
+  textDecoration: 'none'
+};
+
+const LoadMore = ({ onClick }) => (
+  <a href='#' className='load-more' onClick={onClick} style={loadMoreStyle}>
+    <FormattedMessage id='status.load_more' defaultMessage='Load more' />
+  </a>
+);
+
+LoadMore.propTypes = {
+  onClick: React.PropTypes.func
+};
+
+export default LoadMore;