Django-sitetree

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* IMPORTANT: Caching reworked.
* IMPORTANT: Dropped Django 1.5, 1.6 support (will not be tested anymore).
+ Added `ITEMS_FIELD_ROOT_ID` setting (see 205).
* Reduced DB hits for trees with lots of permissions (see 213).
* Improved `sitetreeload` command py3 compatibility (see 209).
* Fixed `sitetreeload` unable to load some twisted tree structures (see 209).
* Fixed `sitetree_resync_apps` run without args.
* Fixed package distribution (see 222).

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+ Prevent TreeItems from being their own parents (see 200).
+ Added `toolbox` module as API single entry point.
+ Added `exceptions` module.
* Django 1.10 compatibility improvements.
* Cache.reset() misbehavior fixed (closes 191).
* Fixed broken delete operation in admin for custom TreeItem (see 190).
* Reduced number of cache calls (see 194).

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* Django 1.9 compatibility improvements.

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+ Added Norwegian translation.
+ Added SITETREE_RAISE_ITEMS_ERRORS_ON_DEBUG setting (see 157).
+ Exposed SITETREE_CACHE_TIMEOUT setting.
+ Added `as` clause support for `sitetree_page_title`, `sitetree_page_description` and `sitetree_page_hint` template tags.
* Fixed cache problems when using sitetree_resync_apps (see 135, 166).
* Fixed disappearing tree items for guests in Admin contrib (Django 1.8) (see 164).
* Fix deprecation warning in Django 1.8 (see 178).
* Fixed permissions check for dynamic tree items (see 165).

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+ Introduced Django 1.8 support (see 152).
* Fixed extra spaces issue in breadcrumbs (closes 150).

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+ Implemented `django-smuggler` thirdparty support.
+ Implemented `i18n_patterns` compatibility (closes 148).
* Fixed menu alias clash with context variable (closes 117).