ensure text panel content is hidden until showdown.js is available

panels/text/module.html

 <kibana-panel ng-controller='text' ng-init="init()">
   <!--<p ng-style="panel.style" ng-bind-html-unsafe="panel.content | striphtml | newlines"></p>-->
-  <markdown>
+  <markdown ng-show="ready">
     {{panel.content}}
   </markdown>
 </kibana-panel>
\ No newline at end of file

panels/text/module.js

@@ -10,6 +10,7 @@ angular.module('kibana.text', [])
   _.defaults($scope.panel,_d);
 
   $scope.init = function() {
+    $scope.ready = false;
   }
 
 }).directive('markdown', function() {
@@ -23,6 +24,7 @@ angular.module('kibana.text', [])
       function render_panel() {
         var scripts = $LAB.script("panels/text/lib/showdown.js")
         scripts.wait(function(){
+          scope.ready = true;
           var converter = new Showdown.converter();
           var text = scope.panel.content.replace(/&/g, '&')
             .replace(/>/g, '>')