2013-07-30: Fix including nickname in Truster public key hash.

Fix including nickname in Truster public key hash.

diff --git a/infocalypse/wot_id.py b/infocalypse/wot_id.py
--- a/infocalypse/wot_id.py
+++ b/infocalypse/wot_id.py
@@ -166,7 +166,7 @@ def _get_identity(wot_identifier, truste
 
     # key_prefix must be a complete key for the lookup to succeed.
     params = {'Message': 'GetIdentity',
-              'Truster': truster,
+              'Truster': truster.identity_id,
               'Identity': key_prefix}
     response = \
         node.fcpPluginMessage(async=False,