Add modal look to authentication flows

This changes the auth screens to use the modal-like style of the redesign.

This does not attempt to style the actual body content of each screen.  Instead,
it covers the header area with logo, footer links, and overall modal container
only.

src/components/views/auth/AuthPage.js

@@ -18,16 +18,20 @@ limitations under the License.
 'use strict';
 
 const React = require('react');
+import sdk from '../../../index';
 
 module.exports = React.createClass({
     displayName: 'AuthPage',
 
     render: function() {
+        const AuthFooter = sdk.getComponent('auth.AuthFooter');
+
         return (
             <div className="mx_AuthPage">
                 <div className="mx_AuthPage_modal">
                     { this.props.children }
                 </div>
+                <AuthFooter />
             </div>
         );
     },