Skip tests for ol.format.MVT in IE9

test/spec/ol/format/mvtformat.test.js

@@ -1,7 +1,7 @@
 goog.provide('ol.test.format.MVT');
 
-
-describe('ol.format.MVT', function() {
+(typeof ArrayBuffer == 'function' ? describe : xdescribe)('ol.format.MVT',
+    function() {
 
       var data;
       beforeEach(function(done) {

test/spec/ol/source/rastersource.test.js

@@ -120,7 +120,8 @@ function itNoPhantom() {
 
         });
 
-    itNoPhantom('allows operation type to be set to "image"', function(done) {
+        itNoPhantom('allows operation type to be set to "image"',
+            function(done) {
 
               var log = [];