Squashed spy refactor and new spy syntax

Jasmine spies now have a 'and' property which allows the user to
change the spy's execution strategy-- such as '.and.callReturn(4)'
and a 'calls' property which allows inspection of the calls a spy
has received.

* This is a breaking change *

There is a CallTracker that keeps track of all calls and arguments
and a SpyStrategy which determines what the spy should do when it
is called.

src/core/SpyStrategy.js

@@ -0,0 +1,45 @@
+getJasmineRequireObj().SpyStrategy = function() {
+
+  function SpyStrategy(options) {
+    options = options || {};
+
+    var identity = options.name || "unknown",
+        originalFn = options.fn || function() {},
+        getSpy = options.getSpy || function() {},
+        plan = function() {};
+
+    this.identity = function() {
+      return identity;
+    };
+
+    this.exec = function() {
+      return plan.apply(this, arguments);
+    };
+
+    this.callThrough = function() {
+      plan = originalFn;
+      return getSpy();
+    };
+
+    this.callReturn = function(value) {
+      plan = function() {
+        return value;
+      };
+      return getSpy();
+    };
+
+    this.callThrow = function(something) {
+      plan = function() {
+        throw something;
+      };
+      return getSpy();
+    };
+
+    this.callFake = function(fn) {
+      plan = fn;
+      return getSpy();
+    };
+  }
+
+  return SpyStrategy;
+};