[ABANDONED] Implement Promises.

LayoutTests/fast/js/Promise-catch-expected.txt

+Test Promise.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+PASS thisInInit === firstPromise is true
+PASS firstPromise instanceof Promise is true
+PASS secondPromise instanceof Promise is true
+PASS thisInFulfillCallback === firstPromise is false
+PASS thisInFulfillCallback === secondPromise is true
+PASS value is "hello"
+PASS fulfilled
+PASS successfullyParsed is true
+
+TEST COMPLETE
+}); shouldBeTrue("thisInInit === firstPromise"); shouldBeTrue("firstPromise instanceof Promise"); shouldBeTrue("secondPromise instanceof Promise"); resolver.reject("hello");