define type for props.id

Author: AlexKVal

src/Input.js

@@ -24,6 +24,7 @@ const Input = React.createClass({
       return React.PropTypes.oneOf(['success', 'warning', 'error']).apply(null, arguments);
     },
     hasFeedback: React.PropTypes.bool,
+    id: React.PropTypes.string,
     groupClassName: React.PropTypes.string,
     wrapperClassName: React.PropTypes.string,
     labelClassName: React.PropTypes.string,

src/SplitButton.js

@@ -13,6 +13,7 @@ const SplitButton = React.createClass({
     pullRight:     React.PropTypes.bool,
     title:         React.PropTypes.node,
     href:          React.PropTypes.string,
+    id:            React.PropTypes.string,
     target:        React.PropTypes.string,
     dropdownTitle: React.PropTypes.node,
     onClick:       React.PropTypes.func,

src/TabbedArea.js

@@ -25,6 +25,7 @@ const TabbedArea = React.createClass({
     defaultActiveKey: React.PropTypes.any,
     bsStyle: React.PropTypes.oneOf(['tabs', 'pills']),
     animation: React.PropTypes.bool,
+    id: React.PropTypes.string,
     onSelect: React.PropTypes.func
   },