Add support for Element#getAttributes

sky/tests/lowlevel/attribute-collection.sky

Index: sky/tests/lowlevel/attribute-collection.sky
diff --git a/sky/tests/lowlevel/attribute-collection.sky b/sky/tests/lowlevel/attribute-collection.sky
index c6380e0d59c5acb6883cd2c640ac236c515c1f04..33817def468511ba56d1c8a6b9bba474010bf15f 100644
--- a/sky/tests/lowlevel/attribute-collection.sky
+++ b/sky/tests/lowlevel/attribute-collection.sky
@@ -24,6 +24,16 @@ describe("Attribute collection", function() {
     assert.equal(div.attributes.attr0.value, "value0");
     assert.equal(div.attributes.attr1.value, "value1");
   });
+  it("should get all at once", function() {
+    div.setAttribute("attr0", "value0");
+    div.setAttribute("attr1", "value1");
+    var attrs = div.getAttributes();
+    assert.equal(attrs.length, 2);
+    assert.equal(attrs[0].name, "attr0");
+    assert.equal(attrs[0].value, "value0");
+    assert.equal(attrs[1].name, "attr1");
+    assert.equal(attrs[1].value, "value1");
+  });
   it("should set by name", function() {
     div.setAttribute("attrName", "value0");
     div.attributes.attrName.value = "new value";