Rename the TensorBoard "events" dashboard to "scalars".

This is a much more sensible name, as the scalar dashboard shows all the scalar data collected by tf.summary.scalar.
Change: 137766817

Author: Dan Mané

tensorflow/tensorboard/components/tf_globals/globals.ts

@@ -19,7 +19,7 @@ module TF.Globals {
 
   // The names of TensorBoard tabs.
   export var TABS =
-      ['events', 'images', 'audio', 'graphs', 'distributions', 'histograms'];
+      ['scalars', 'images', 'audio', 'graphs', 'distributions', 'histograms'];
 
   if (PROJECTOR_LAUNCHED) {
     TABS.push('projections');