Pull async matchers out to their own functions

- Makes AsyncExpectation closer to Expectation

spec/core/matchers/async/toBeRejectedSpec.js

@@ -0,0 +1,23 @@
+describe('toBeRejected', function() {
+  it('passes if the actual is rejected', function() {
+    jasmine.getEnv().requirePromises();
+
+    var matcher = jasmineUnderTest.asyncMatchers.toBeRejected(jasmineUnderTest.matchersUtil),
+      actual = Promise.reject('AsyncExpectationSpec rejection');
+
+    return matcher.compare(actual).then(function(result) {
+      expect(result).toEqual(jasmine.objectContaining({pass: true}));
+    });
+  });
+
+  it('fails if the actual is resolved', function() {
+    jasmine.getEnv().requirePromises();
+
+    var matcher = jasmineUnderTest.asyncMatchers.toBeRejected(jasmineUnderTest.matchersUtil),
+      actual = Promise.resolve();
+
+    return matcher.compare(actual).then(function(result) {
+      expect(result).toEqual(jasmine.objectContaining({pass: false}));
+    });
+  });
+});