ecc: API changes: verify_message_hash to return bool instead of raising

verify_message_hash and verify_message_for_address now return bool
instead of raising Exceptions on bad signatures.

electrum/tests/test_bitcoin.py

@@ -152,7 +152,7 @@ class Test_bitcoin(ElectrumTestCase):
 
         signature = eck.sign_message(message, True)
         #print signature
-        eck.verify_message_for_address(signature, message)
+        self.assertTrue(eck.verify_message_for_address(signature, message))
 
     def test_ecc_sanity(self):
         G = ecc.GENERATOR