CIRCLE / django-taggit

Added japanese translation.

Mistake in docs/index.txt:

SOUTH_MIGRATIONS_MODULES should be SOUTH_MIGRATION_MODULES

added italian translation

South error on import

Fixes gh-219.

Conflicts:
	taggit/managers.py

Added Esperanto translation.

Allow pluggable manager for TaggableManager.

Wrong south setting in the docs

fix contenttypes.generic warning in django 1.7

Should be `SOUTH_MIGRATION_MODULES`, see:
http://south.readthedocs.org/en/latest/settings.html#south-migration-modules

This accepts "to" as kwarg, and provides it via `deconstruct`, and also
changes `deconstruct` to always provide/set "through".

This is more explicit and since the manager always uses a through model
internally, this describes it better.

This probably fixes the travis builds.

Conflicts:
	taggit/managers.py

According to the documentation [1], non-default kwargs need to get
returned.

1: https://docs.djangoproject.com/en/dev/howto/custom-model-fields/#field-deconstruction

Prevented infinite loops on Tag.save()

remember to set attname if django < 1.7

Note: Now Tag.save() can raise an IntegrityError in case of concurrency
issues, your app will need to handle that.

Use Django's atomic when available.