fix #31

* implement column.hidden

* add story for column.hidden

* add docs for column.hidden

packages/react-bootstrap-table2-example/examples/columns/column-hidden-table.js

@@ -0,0 +1,50 @@
+/* eslint no-unused-vars: 0 */
+import React from 'react';
+
+import { BootstrapTable } from 'react-bootstrap-table2';
+
+const products = [];
+
+function addProducts(quantity) {
+  const startId = products.length;
+  for (let i = 0; i < quantity; i += 1) {
+    const id = startId + i;
+    products.push({
+      id,
+      name: `Item name ${id}`,
+      price: 2100 + i
+    });
+  }
+}
+
+addProducts(5);
+
+const columns = [{
+  dataField: 'id',
+  text: 'Product ID',
+  hidden: true
+}, {
+  dataField: 'name',
+  text: 'Product Name'
+}, {
+  dataField: 'price',
+  text: 'Product Price'
+}];
+
+export default () => (
+  <div>
+    <BootstrapTable keyField="id" data={ products } columns={ columns } />
+    <pre className="prettyprint lang-js"><code className="language-javascript">{`
+const columns = [{
+  dataField: 'id',
+  text: 'Product ID',
+  hidden: true
+},
+// omit...
+];
+
+<BootstrapTable keyField='id' data={ products } columns={ columns } />
+    `}
+    </code></pre>
+  </div>
+);