Attempt at normalizing error stacks across browsers.

Failed expectations now have a `stack` property, remove `trace.stack`

spec/core/ExceptionFormatterSpec.js

@@ -1,26 +1,52 @@
 describe("ExceptionFormatter", function() {
+  describe("#message", function() {
+    it('formats Firefox exception messages', function() {
+      var sampleFirefoxException = {
+          fileName: 'foo.js',
+          lineNumber: '1978',
+          message: 'you got your foo in my bar',
+          name: 'A Classic Mistake'
+        },
+        exceptionFormatter = new jasmine.ExceptionFormatter(),
+        message = exceptionFormatter.message(sampleFirefoxException);
 
-  it('formats Firefox exception messages', function() {
-    var sampleFirefoxException = {
-        fileName: 'foo.js',
-        line: '1978',
-        message: 'you got your foo in my bar',
-        name: 'A Classic Mistake'
-      },
-      message = jasmine.exceptionMessageFor(sampleFirefoxException);
+      expect(message).toEqual('A Classic Mistake: you got your foo in my bar in foo.js (line 1978)');
+    });
 
-    expect(message).toEqual('A Classic Mistake: you got your foo in my bar in foo.js (line 1978)');
+    it('formats Webkit exception messages', function() {
+      var sampleWebkitException = {
+          sourceURL: 'foo.js',
+          line: '1978',
+          message: 'you got your foo in my bar',
+          name: 'A Classic Mistake'
+        },
+        exceptionFormatter = new jasmine.ExceptionFormatter(),
+        message = exceptionFormatter.message(sampleWebkitException);
+
+      expect(message).toEqual('A Classic Mistake: you got your foo in my bar in foo.js (line 1978)');
+    });
+
+    it('formats V8 exception messages', function() {
+      var sampleV8 = {
+          message: 'you got your foo in my bar',
+          name: 'A Classic Mistake'
+        },
+        exceptionFormatter = new jasmine.ExceptionFormatter(),
+        message = exceptionFormatter.message(sampleV8);
+
+      expect(message).toEqual('A Classic Mistake: you got your foo in my bar');
+
+    });
   });
 
-  it('formats Webkit exception messages', function() {
-    var sampleWebkitException = {
-        sourceURL: 'foo.js',
-        lineNumber: '1978',
-        message: 'you got your foo in my bar',
-        name: 'A Classic Mistake'
-      },
-      message = jasmine.exceptionMessageFor(sampleWebkitException);
+  describe("#stack", function() {
+    it("formats stack traces from Webkit, Firefox or node.js", function() {
+      var error = new Error("an error");
+      expect(new jasmine.ExceptionFormatter().stack(error)).toMatch(/ExceptionFormatterSpec\.js.*\d+/)
+    });
 
-    expect(message).toEqual('A Classic Mistake: you got your foo in my bar in foo.js (line 1978)');
+    it("returns null if no Error provided", function() {
+      expect(new jasmine.ExceptionFormatter().stack()).toBeNull();
+    });
   });
 });