remove ie warning in favor of better ie test in filesaver

Author: timelyportfolio

src/components/modebar/buttons.js

@@ -49,12 +49,6 @@ modeBarButtons.toImage = {
     title: 'Download plot as a png',
     icon: Icons.camera,
     click: function(gd) {
-        if(Lib.isIE()) {
-            Lib.notifier('Snapshotting is unavailable in Internet Explorer. ' +
-                         'Consider exporting your images using the Plotly Cloud', 'long');
-            return;
-        }
-
         Lib.notifier('Taking snapshot - this may take a few seconds', 'long');
 
         downloadImage(gd)