fix(React): require React in order for JSX to work in widgets

Problem: we now use ReactDom.render in widgets/*.
JSX is compiled to React.createElement.

React is not defined since not in the current scope.

Solutions:
- require React and move on (and ignore the eslint check)
- use React.createElement by hand and do not use JSX in widgets

I did the first solution. Easier :)

Author: vvo

Diff for: .eslintrc

@@ -1,3 +1,6 @@
 {
-  "extends": "algolia"
+  "extends": "algolia",
+  "rules": {
+    "no-unused-vars": [2, {"vars": "local", "args": "after-used", "varsIgnorePattern": "^React$"}],
+  }
 }

Diff for: index.js

@@ -1,3 +1,5 @@
+var React = require('react');
+
 require('./shams/Object.freeze.js');
 
 var toFactory = require('to-factory');

Diff for: widgets/hierarchicalMenu.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../lib/utils.js');

Diff for: widgets/hits.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../lib/utils.js');

Diff for: widgets/index-selector.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var findIndex = require('lodash/array/findIndex');

Diff for: widgets/menu.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../lib/utils.js');

Diff for: widgets/pagination.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 var defaults = require('lodash/object/defaults');
 

Diff for: widgets/range-slider.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../lib/utils.js');

Diff for: widgets/refinement-list.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../lib/utils.js');

Diff for: widgets/stats/index.js

@@ -1,3 +1,4 @@
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../../lib/utils.js');

Diff for: widgets/toggle.js

@@ -1,4 +1,5 @@
 var find = require('lodash/collection/find');
+var React = require('react');
 var ReactDOM = require('react-dom');
 
 var utils = require('../lib/utils.js');