Don't keep the expected and actual for a passed expectation

- It causes memory problems in phantom and you probably don't need it
  anyways.

Fixes #640 Fixes #690

lib/jasmine-core/jasmine.js

@@ -1411,15 +1411,20 @@ getJasmineRequireObj().buildExpectationResult = function() {
     var messageFormatter = options.messageFormatter || function() {},
       stackFormatter = options.stackFormatter || function() {};
 
-    return {
+    var result = {
       matcherName: options.matcherName,
-      expected: options.expected,
-      actual: options.actual,
       message: message(),
       stack: stack(),
       passed: options.passed
     };
 
+    if(!result.passed) {
+      result.expected = options.expected;
+      result.actual = options.actual;
+    }
+
+    return result;
+
     function message() {
       if (options.passed) {
         return 'Passed.';

src/core/ExpectationResult.js

@@ -4,15 +4,20 @@ getJasmineRequireObj().buildExpectationResult = function() {
     var messageFormatter = options.messageFormatter || function() {},
       stackFormatter = options.stackFormatter || function() {};
 
-    return {
+    var result = {
       matcherName: options.matcherName,
-      expected: options.expected,
-      actual: options.actual,
       message: message(),
       stack: stack(),
       passed: options.passed
     };
 
+    if(!result.passed) {
+      result.expected = options.expected;
+      result.actual = options.actual;
+    }
+
+    return result;
+
     function message() {
       if (options.passed) {
         return 'Passed.';