code cleanup:

- cycles ui used 'cscene' for scene.cycles and scene.cycles_curves
- style cleanup

source/tests/bl_load_addons.py

@@ -26,6 +26,7 @@ import addon_utils
 import sys
 import imp
 
+
 def disable_addons():
     # first disable all
     addons = bpy.context.user_preferences.addons