BUG: Enable comparison of an Asset to an int64 on 32-bit python

We use a number of mappings keyed by int64, which otherwise raised
KeyErrors for Assets.

tests/test_assets.py

@@ -29,7 +29,7 @@ from pandas.tseries.tools import normalize_date
 from pandas.util.testing import assert_frame_equal
 
 from nose_parameterized import parameterized
-from numpy import full
+from numpy import full, int32, int64
 import sqlalchemy as sa
 
 from zipline.assets import (
@@ -39,7 +39,7 @@ from zipline.assets import (
     AssetFinder,
     AssetFinderCachedEquities,
 )
-from six import itervalues
+from six import itervalues, integer_types
 from toolz import valmap
 
 from zipline.assets.futures import (
@@ -212,6 +212,14 @@ class AssetTestCase(TestCase):
         self.assertEqual(s_23, s_23)
         self.assertEqual(s_23, 23)
         self.assertEqual(23, s_23)
+        self.assertEqual(int32(23), s_23)
+        self.assertEqual(int64(23), s_23)
+        self.assertEqual(s_23, int32(23))
+        self.assertEqual(s_23, int64(23))
+        # Check all int types (includes long on py2):
+        for int_type in integer_types:
+            self.assertEqual(int_type(23), s_23)
+            self.assertEqual(s_23, int_type(23))
 
         self.assertNotEqual(s_23, s_24)
         self.assertNotEqual(s_23, 24)