Adding none Django method

Author: Mike Hearing

pyrestorm/__init__.py

@@ -1 +1 @@
-__version__ = '0.1.2'
+__version__ = '0.1.3'

pyrestorm/query.py

@@ -194,5 +194,12 @@ def filter(self, **kwargs):
 
         return clone
 
+    def none(self, *args, **kwargs):
+        '''Imitate an empty `RestQueryset` with no results
+        '''
+        return iter([])
+
     def all(self, *args, **kwargs):
+        '''Unmodified query to return all results in the `RestQueryset`
+        '''
         return self._clone()