[caribou] Add some code compatibility for python3. It is seen that on Fedora Caribou rpm build failed for pyth

[Daiki Ueno <dueno src gnome org>]

commit 067cf731024fd08136a84684539f010dd9514d69
Author: Parag Nemade <pnemade redhat com>
Date:   Tue Nov 24 11:50:25 2015 +0530

    Add some code compatibility for python3. It is seen that on Fedora Caribou rpm build failed for python3. 
If used 2to3 tool everything works fine, but if I remove it then build fails. I tried to find minimal changes 
required in code compared to what 2to3 tool is offering changes. With this attached patch build on Fedora for 
python3 succeeds.

 caribou/antler/window.py             |    4 ++--
 caribou/settings/settings_manager.py |    5 ++---
 2 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/caribou/antler/window.py b/caribou/antler/window.py
index 959b825..0061040 100644
--- a/caribou/antler/window.py
+++ b/caribou/antler/window.py
@@ -54,7 +54,7 @@ class AnimatedWindowBase(Gtk.Window, Clutter.Animatable):
         elif property.name == "antler-window-y":
             return self.get_position()[1]
         else:
-            raise AttributeError, 'unknown property %s' % property.name
+            raise AttributeError('unknown property %s' % property.name)
 
     def do_set_property(self, property, value):
         if property.name == "antler-window-x":
@@ -64,7 +64,7 @@ class AnimatedWindowBase(Gtk.Window, Clutter.Animatable):
             if value is not None:
                 self.move(self.get_position()[0], value)
         else:
-            raise AttributeError, 'unknown property %s' % property.name
+            raise AttributeError('unknown property %s' % property.name)
 
     def do_animate_property(self, animation, prop_name, initial_value,
                             final_value, progress, gvalue):
diff --git a/caribou/settings/settings_manager.py b/caribou/settings/settings_manager.py
index 4e9b43f..062a278 100644
--- a/caribou/settings/settings_manager.py
+++ b/caribou/settings/settings_manager.py
@@ -16,12 +16,11 @@ class SettingsManager(object):
         try:
             return self._settings_map[name]
         except KeyError:
-            raise AttributeError, "no setting named '%s'" % name
+            raise AttributeError("no setting named '%s'" % name)
 
     def _map_settings(self, setting):
         if self._settings_map.has_key(setting.name):
-            raise ValueError, \
-                "more than one setting has the name '%s'" % setting.name
+            raise ValueError("more than one setting has the name '%s'" % setting.name)
         self._settings_map[setting.name] = setting
         
         for s in setting: