Initial Python 3 compatible code

src/keystrokeEditor/__init__.py

@@ -1,2 +1,3 @@
 from __future__ import absolute_import
+from __future__ import unicode_literals
 from .keystrokeEditor import KeystrokeEditor

src/keystrokeEditor/constants.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
 actions = {
 "up": _(u"Go up in the current buffer"),
 "down": _(u"Go down in the current buffer"),

src/keystrokeEditor/keystrokeEditor.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import
+from __future__ import unicode_literals
+from builtins import object
 import widgetUtils
 import config
 from . import wx_ui

src/keystrokeEditor/wx_ui.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
 import wx
 from multiplatform_widgets import widgets
 from wxUI.dialogs import baseDialog