buildExpectationResult now returns a data object.

- Meant for passing to reporters.

src/core/ExpectationResult.js

@@ -1,20 +1,12 @@
 //TODO: expectation result may make more sense as a presentation of an expectation.
-jasmine.ExpectationResult = function(params) {
-  var self = this;
-  var trace = (params.trace || new Error(this.message));
-  var message = params.passed ? 'Passed.' : params.message;
-  return jasmine.util.extend(self, {
+jasmine.buildExpectationResult = function(params) {
+  return {
     type: 'expect',
     matcherName: params.matcherName,
     expected: params.expected,
     actual:  params.actual,
-    message: message,
-    trace: params.passed ? '' : trace,
-    toString: function() {
-      return message;
-    },
-    passed: function() {
-      return params.passed;
-    }
-  });
+    message: params.passed ? 'Passed.' : params.message,
+    trace: params.passed ? '' : (params.trace || new Error(this.message)),
+    passed: params.passed
+  };
 };