Restore no-multiple-empty-lines rule

It was enforced by JSCS, but it was lost during translition to
ESLint.

Change-Id: I3a928a946ab4e55f028b4280258d32b7c1d74603

.eslintrc

@@ -111,6 +111,7 @@
     no-array-constructor: 2
     no-new-object: 2
     no-lonely-if: 2
+    no-multiple-empty-lines: [2, {max: 1}]
     no-spaced-func: 2
     no-unneeded-ternary: 2
     object-curly-spacing: 2

static/views/wizard.js

@@ -298,7 +298,6 @@ function($, _, i18n, React, Backbone, utils, models, componentMixins, dialogs, c
         Finish
     ];
 
-
     var CreateClusterWizard = React.createClass({
         mixins: [dialogs.dialogMixin],
         getInitialState: function() {