Report the ID of each suite/spec's parent

This is intended to support parallel execution, which is planned for a
future release of Jasmine. Because the execution of unrelated suites will
interleave when run in parallel, reporters will not be able to assume
that the most recent `suiteStarted` event identifies the parent of the
current suite/spec. By adding this feature now, we allow reporters to
support both parallel execution and at least some 4.x versions without
having to implement two different ways of finding the parent suite.

spec/core/SpecSpec.js

@@ -195,6 +195,7 @@ describe('Spec', function() {
         onStart: startCallback,
         resultCallback: resultCallback,
         description: 'with a spec',
+        parentSuiteId: 'suite1',
         filename: 'someSpecFile.js',
         getSpecName: function() {
           return 'a suite with a spec';
@@ -220,6 +221,7 @@ describe('Spec', function() {
         status: 'pending',
         description: 'with a spec',
         fullName: 'a suite with a spec',
+        parentSuiteId: 'suite1',
         filename: 'someSpecFile.js',
         failedExpectations: [],
         passedExpectations: [],