Resolves #1058 -- dont show cancel button when in teaching mode

src/js/views/index.js

@@ -140,7 +140,8 @@ var ConfirmCancelView = ResolveRejectBase.extend({
     this.deferred = options.deferred || Q.defer();
     this.JSON = {
       confirm: options.confirm || intl.str('confirm-button'),
-      cancel: options.cancel || intl.str('cancel-button')
+      cancel: options.cancel || intl.str('cancel-button'),
+      disableCancelButton: !!options.disableCancelButton,
     };
 
     this.render();

src/js/views/rebaseView.js

@@ -142,7 +142,8 @@ var InteractiveRebaseView = ContainedBase.extend({
     // finally get our buttons
     new ConfirmCancelView({
       destination: this.$('.confirmCancel'),
-      deferred: deferred
+      deferred: deferred,
+      disableCancelButton: !!this.options.aboveAll,
     });
   }
 });

src/template.index.html

@@ -326,9 +326,13 @@
   </script>
 
   <script type="text/html" id="confirm-cancel-template">
+    <% if (disableCancelButton) { %>
+      <span></span>
+    <% } else { %>
       <button class="noStyle box cancelButton uiButton uiButtonRed">
         <%= cancel %>
       </button>
+    <% } %>
     <button class="noStyle box confirmButton uiButton uiButtonYellow">
       <%= confirm %>
     </button>