Resolve confusion between ColumnBackButton and the slim version that

the public timeline has been using

app/assets/javascripts/components/components/column_back_button_slim.jsx

@@ -0,0 +1,46 @@
+import PureRenderMixin from 'react-addons-pure-render-mixin';
+import { FormattedMessage } from 'react-intl';
+
+const outerStyle = {
+  position: 'absolute',
+  right: '0',
+  top: '-48px',
+  padding: '15px',
+  fontSize: '16px',
+  background: '#2f3441',
+  flex: '0 0 auto',
+  cursor: 'pointer',
+  color: '#2b90d9'
+};
+
+const iconStyle = {
+  display: 'inline-block',
+  marginRight: '5px'
+};
+
+const ColumnBackButtonSlim = React.createClass({
+
+  contextTypes: {
+    router: React.PropTypes.object
+  },
+
+  mixins: [PureRenderMixin],
+
+  handleClick () {
+    this.context.router.push('/');
+  },
+
+  render () {
+    return (
+      <div style={{ position: 'relative' }}>
+        <div style={outerStyle} onClick={this.handleClick} className='column-back-button'>
+          <i className='fa fa-fw fa-chevron-left' style={iconStyle} />
+          <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
+        </div>
+      </div>
+    );
+  }
+
+});
+
+export default ColumnBackButtonSlim;