Make toEqual matcher report the difference between objects

- Mismatches deep within object/array structures are pinpointed with a JsonPath-like syntax.

spec/core/matchers/matchersUtilSpec.js

@@ -61,10 +61,14 @@ describe("matchersUtil", function() {
       expect(jasmineUnderTest.matchersUtil.equals(foo, [undefined])).toBe(true);
     });
 
-    it("fails for Arrays that are not equivalent", function() {
+    it("fails for Arrays that have different lengths", function() {
       expect(jasmineUnderTest.matchersUtil.equals([1, 2], [1, 2, 3])).toBe(false);
     });
 
+    it("fails for Arrays that have different elements", function() {
+      expect(jasmineUnderTest.matchersUtil.equals([1, 2, 3], [1, 5, 3])).toBe(false);
+    });
+
     it("fails for Arrays whose contents are equivalent, but have differing properties", function() {
       var one = [1,2,3],
           two = [1,2,3];
@@ -136,6 +140,13 @@ describe("matchersUtil", function() {
       expect(jasmineUnderTest.matchersUtil.equals(actual, expected)).toBe(false);
     });
 
+    it("fails for Objects that have the same number of keys, but different keys/values", function () {
+      var expected = { a: undefined },
+        actual = { b: 1 };
+
+      expect(jasmineUnderTest.matchersUtil.equals(actual, expected)).toBe(false);
+    })
+
     it("fails when comparing an empty object to an empty array (issue #114)", function() {
       var emptyObject = {},
         emptyArray = [];