feat(CounterfeitPromise): add raw property

A new public property `raw` has been added to `CounterfeitPromise`. This
property references the promise object associated with the internal
deferred object.

Developers may find it useful to use `raw` if they have a requirement
to override an object property that is a promise in a testing
environment. Contrast this to the requirement to stub a function that
returns a promise, where you would use `counterfeit.stub`.

dist/counterfeit.js

@@ -6,6 +6,8 @@ counterfeit.factory("CounterfeitPromise", function() {
   var $timeout, $q;
 
   function CounterfeitPromise() {
+    this.deferred = undefined;
+    this.raw = undefined;
     this._injectDependecies();
     this.reset();
   }
@@ -26,6 +28,7 @@ counterfeit.factory("CounterfeitPromise", function() {
 
   CounterfeitPromise.prototype.reset = function() {
     this.deferred = $q.defer();
+    this.raw = this.deferred.promise;
     return this.deferred.promise;
   };
   // ------------------------------

src/promise.js

@@ -2,6 +2,8 @@ counterfeit.factory("CounterfeitPromise", function() {
   var $timeout, $q;
 
   function CounterfeitPromise() {
+    this.deferred = undefined;
+    this.raw = undefined;
     this._injectDependecies();
     this.reset();
   }
@@ -22,6 +24,7 @@ counterfeit.factory("CounterfeitPromise", function() {
 
   CounterfeitPromise.prototype.reset = function() {
     this.deferred = $q.defer();
+    this.raw = this.deferred.promise;
     return this.deferred.promise;
   };
   // ------------------------------