Added support for queryset() overrides on admin classes and inline admin classes.

Updated version to 1.4.5.
Updated README with explanation of requirements for overriding queryset() on inline models.
Added extra models to sample project to demonstrate sortable models with custom querysets.
Improved JavaScript of sortables to be more efficient with better comparison checking.
Fixed highlighting of stacked inlines on sort finish.

sample_project/sample_project/settings.py

@@ -122,13 +122,12 @@ INSTALLED_APPS = (
     'django.contrib.sites',
     'django.contrib.messages',
     'django.contrib.staticfiles',
-    # Uncomment the next line to enable the admin:
     'django.contrib.admin',
-    # Uncomment the next line to enable admin documentation:
     'django.contrib.admindocs',
 
     'adminsortable',
     'app',
+    'south',
 )
 
 # A sample logging configuration. The only tangible logging