refactor file structure

browser/components/ExternalLink.js

@@ -0,0 +1,20 @@
+import React, { PropTypes } from 'react'
+const electron = require('electron')
+const shell = electron.shell
+
+export default class ExternalLink extends React.Component {
+  handleClick (e) {
+    shell.openExternal(this.props.href)
+    e.preventDefault()
+  }
+
+  render () {
+    return (
+      <a onClick={e => this.handleClick(e)} {...this.props}/>
+    )
+  }
+}
+
+ExternalLink.propTypes = {
+  href: PropTypes.string
+}