Python3 ready. Py2.7 and Py3 working. Drop PyCObject for all.

Pre Py2.7 support should be possible by including  "capsulethunk.h". (See llvm/wrap.h)

test/asm.py

@@ -25,5 +25,25 @@ class TestAsm(unittest.TestCase):
 
         self.assertEqual(str(m2).strip(), asm.strip())
 
+
+    def test_bitcode(self):
+        # create a module
+        m = Module.new('module1')
+        m.add_global_variable(Type.int(), 'i')
+
+        # write it's assembly representation to a file
+        asm = str(m)
+
+        with open("/tmp/testasm.bc", "wb") as fout:
+            m.to_bitcode(fout)
+
+        # read it back into a module
+        with open("/tmp/testasm.bc", "rb") as fin:
+            m2 = Module.from_bitcode(fin)
+            # The default `m.id` is '<string>'.
+            m2.id = m.id # Copy the name from `m`
+
+        self.assertEqual(str(m2).strip(), asm.strip())
+
 if __name__ == '__main__':
     unittest.main()