Added a basic set of async matchers

- Fixes #1447
- Fixes #1547

src/core/requireInterface.js

@@ -167,6 +167,25 @@ getJasmineRequireObj().interface = function(jasmine, env) {
       return env.expect(actual);
     },
 
+    /**
+     * Create an asynchronous expectation for a spec. Note that the matchers
+     * that are provided by an asynchronous expectation all return promises
+     * which must be either returned from the spec or waited for using `await`
+     * in order for Jasmine to associate them with the correct spec.
+     * @name expectAsync
+     * @function
+     * @global
+     * @param {Object} actual - Actual computed value to test expectations against.
+     * @return {async-matchers}
+     * @example
+     * await expectAsync(somePromise).toBeResolved();
+     * @example
+     * return expectAsync(somePromise).toBeResolved();
+     */
+    expectAsync: function(actual) {
+      return env.expectAsync(actual);
+    },
+
     /**
      * Mark a spec as pending, expectation results will be ignored.
      * @name pending