Support packing memoryview objects

test/test_memoryview.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+
+from msgpack import packb, unpackb
+
+
+def test_pack_memoryview():
+    data = bytearray(range(256))
+    view = memoryview(data)
+    unpacked = unpackb(packb(view))
+    assert data == unpacked