Added the ability to associate trace information with failing specs

This is meant to aid in debugging failures, particularly intermittent
failures, in cases where interactive debugging or console.log aren't
suitable.

spec/core/baseSpec.js

@@ -186,4 +186,12 @@ describe('base helpers', function() {
       });
     });
   });
+
+  describe('trace', function() {
+    it("forwards to the current env's trace function", function() {
+      spyOn(jasmineUnderTest.getEnv(), 'trace');
+      jasmineUnderTest.trace('a message');
+      expect(jasmineUnderTest.getEnv().trace).toHaveBeenCalledWith('a message');
+    });
+  });
 });