Add explicit fail and move on for async functions

- `done` now has a `fail` property which will call the global `fail`
  then continue to the next function in the queue

[finish #73744618] Fix #567 Fix #568

spec/core/integration/EnvSpec.js

@@ -972,6 +972,12 @@ describe("Env integration", function() {
               message: 'Failed: messy message'
             })]
           }));
+          expect(specDone).toHaveBeenCalledWith(jasmine.objectContaining({
+            description: 'fails via the done callback',
+            failedExpectations: [jasmine.objectContaining({
+              message: 'Failed: done failed'
+            })]
+          }));
           expect(specDone).toHaveBeenCalledWith(jasmine.objectContaining({
             description: 'has a message from an Error',
             failedExpectations: [jasmine.objectContaining({
@@ -997,6 +1003,12 @@ describe("Env integration", function() {
           }, 1);
         });
 
+        env.it('fails via the done callback', function(innerDone) {
+          setTimeout(function() {
+            innerDone.fail('done failed');
+          }, 1);
+        });
+
         env.it('has a message from an Error', function(innerDone) {
           setTimeout(function() {
             env.fail(new Error('error message'));