Added mixins for reload development

mixins.py

@@ -0,0 +1,20 @@
+
+class ReloadMixin():
+    def cache(self, callback, do_save=True):
+        cache_dict = {}
+        if do_save:
+            if self.save and callable(self.save):
+                self.save()
+            else:
+                raise ValueError("This object does not have a save function, you must pass save=False for this object type.")
+
+        for key, value in self.__dict__.iteritems():
+            if not callable(value):
+                cache_dict[key] = value
+
+        callback(cache_dict)
+
+    def reload(self, cache):
+        for key, value in cache.iteritems():
+            if self.__dict__[key] != value:
+                self.__dict__[key] = value