Remove 'actual' param from matchers test and message functions. Use this.actual instead. This way, the signature of the test function matches how the matcher is called from a spec.

Spy matchers now throw an exception when called with non-spies, rather than returning false.  This makes the message function simpler, and will work better with future dot-not support.
Added better specs for error conditions on spy matchers.

src/base.js

@@ -324,6 +324,16 @@ jasmine.createSpy = function(name) {
   return spyObj;
 };
 
+/**
+ * Determines whether an object is a spy.
+ *
+ * @param {jasmine.Spy|Object} putativeSpy
+ * @returns {Boolean}
+ */
+jasmine.isSpy = function(putativeSpy) {
+  return putativeSpy && putativeSpy.isSpy;
+};
+
 /**
  * Creates a more complicated spy: an Object that has every property a function that is a spy.  Used for stubbing something
  * large in one call.