Make rake jasmine:ci run specs correctly.

- Will replace rake core_specs.
- Remove obsolete dependencies & files -- most of these were for build tasks we
  are no longer using. Notably, rspec and spec_helper were deleted.

spec/core/TimerSpec.js

@@ -1,13 +0,0 @@
-describe("Timer", function() {
-  it("reports the time elapsed", function() {
-    var fakeNow = jasmine.createSpy('fake Date.now'),
-        timer = new j$.Timer({now: fakeNow});
-
-    fakeNow.and.returnValue(100);
-    timer.start();
-
-    fakeNow.and.returnValue(200);
-
-    expect(timer.elapsed()).toEqual(100);
-  });
-});