misc python3 updates:

- use jsonrpclib-pelix
 - update the kivy gui
 - update plugins

plugins/trustedcoin/qt.py

@@ -37,7 +37,7 @@ from electrum_gui.qt.amountedit import AmountEdit
 from electrum_gui.qt.main_window import StatusBarButton
 from electrum.i18n import _
 from electrum.plugins import hook
-from trustedcoin import TrustedCoinPlugin, server
+from .trustedcoin import TrustedCoinPlugin, server
 
 
 class Plugin(TrustedCoinPlugin):

plugins/trustedcoin/trustedcoin.py

@@ -90,11 +90,10 @@ class TrustedCoinCosignerClient(object):
             kwargs['headers']['content-type'] = 'application/json'
         url = urljoin(self.base_url, relative_url)
         if self.debug:
-            print '%s %s %s' % (method, url, data)
+            print('%s %s %s' % (method, url, data))
         response = requests.request(method, url, **kwargs)
         if self.debug:
-            print response.text
-            print
+            print(response.text)
         if response.status_code != 200:
             message = str(response.text)
             if response.headers.get('content-type') == 'application/json':