Adapt plugin sharing (#1553)

* Reuse old package config

* Add plugin config shape

* Add ButtonGroup to core components

* List all sharing sites

* Displaying buttons from config

* First iteration of Dropdown component (need CSS)

* Using Dropdown for sharing button

* Create HotKeys component

* Move Backdrop to its own file

* Trying a cleaner API for Dropdown

* Add README.md

* livereload: Add missing gitbook-plugin dependency

* sharing: Now use Immutable state

* sharing: Adapt quickly to new Dropdown

* sharing: Fix sharing from dropdown

1 files changed, 23 insertions, 0 deletions

diff --git a/packages/gitbook-core/src/components/ButtonGroup.js b/packages/gitbook-core/src/components/ButtonGroup.js
new file mode 100644
index 0000000..4c20b68
--- /dev/null
+++ b/packages/gitbook-core/src/components/ButtonGroup.js
@@ -0,0 +1,23 @@
+const React = require('react');
+const classNames = require('classnames');
+
+const ButtonGroup = React.createClass({
+    propTypes: {
+        className: React.PropTypes.string,
+        children:  React.PropTypes.node,
+        onClick:   React.PropTypes.func
+    },
+
+    render() {
+        let { className, children } = this.props;
+
+        className = classNames(
+            'GitBook-ButtonGroup',
+            className
+        );
+
+        return <div className={className}>{children}</div>;
+    }
+});
+
+module.exports = ButtonGroup;