bugfix: returning real list instead of generator

Changed reversed(content) to content[::-1] in order to return
a real list and not a generator.
The code in PaginatedListBase.__grow does an iteration over
newElements when using `+=` and then returns them.
When using a generator, newElements would be empty when they are returned.

github/PaginatedList.py

@@ -147,7 +147,7 @@ class PaginatedList(PaginatedListBase):
             for element in data
         ]
         if self._reversed:
-            return reversed(content)
+            return content[::-1]
         return content
 
     def __parseLinkHeader(self, headers):

github/tests/PaginatedList.py

@@ -60,6 +60,13 @@ class PaginatedList(Framework.TestCase):
         self.assertEqual(r[14].id, 166212)
         self.assertEqual(r[15].id, 166214)
 
+    def testReversedIterationSupportsIterator(self):
+        r = self.list.reversed
+        for i in r:
+            self.assertEqual(i.id, 4286936)
+            return
+        self.fail("empty iterator")
+
     def testIntIndexingInThirdPage(self):
         self.assertEqual(self.list[50].id, 3911629)
         self.assertEqual(self.list[74].id, 3605277)