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/javascripts/core/matchers/toBeNaNSpec.js

@@ -0,0 +1,36 @@
+describe("toBeNaN", function() {
+  it("passes for NaN with a custom .not fail", function() {
+    var matcher = j$.matchers.toBeNaN(),
+      result;
+
+    result = matcher.compare(Number.NaN);
+    expect(result.pass).toBe(true);
+    expect(result.message).toEqual("Expected actual not to be NaN.");
+  });
+
+  it("fails for anything not a NaN", function() {
+    var matcher = j$.matchers.toBeNaN();
+
+    result = matcher.compare(1);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(null);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(void 0);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare('');
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(Number.POSITIVE_INFINITY);
+    expect(result.pass).toBe(false);
+  });
+
+  it("has a custom message on failure", function() {
+    var matcher = j$.matchers.toBeNaN(),
+      result = matcher.compare(0);
+
+    expect(result.message).toEqual("Expected 0 to be NaN.");
+  });
+});