Introduced a 'multiSort' flag

Defaults to 'true'
A 'false' value will turn multi-sort off.

docs/src/examples/expander/index.js

@@ -0,0 +1,54 @@
+/* eslint-disable */
+
+import React from 'react';
+
+import ReactTable from '../../../../lib/index'
+import '../../../../react-table.css'
+
+const data = [
+  {one:"1.1",two:"1.2"},
+  {one:"2.1",two:"2.2"},
+  {one:"3.1",two:"3.2"},
+  {one:"4.1",two:"4.2"},
+]
+
+const columns = [
+  {accessor:'one', Header: 'One'},
+  {accessor:'two', Header: 'Two'},
+]
+
+class ExpanderComponent extends React.Component {
+  render()
+  {
+    return (
+      <div className={`rt-expander ${this.props.isExpanded ? '-open' : ''}`}>
+        &bull;
+      </div>                
+    )
+  }
+}
+
+class SubComponent extends React.Component {
+  render()
+  {
+    return <div>Nothing</div>
+  }
+}
+
+export default class ComponentTest extends React.Component {
+  render()
+  {
+    const rtProps = {
+      data,
+      columns,
+      ExpanderComponent: (props)=><ExpanderComponent {...props} />,
+      SubComponent: (props)=><SubComponent {...props} />,
+      multiSort: false,
+    }
+    return (
+      <ReactTable 
+        {...rtProps}
+      />
+    )
+  }
+}