Mongoengine

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- Fixed issue where db_alias wasn't inherited

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- Updated validation error messages
- Added support for null / zero / false values in item_frequencies
- Fixed cascade save edge case
- Fixed geo index creation through reference fields
- Added support for args / kwargs when using queryset_manager
- Deref list custom id fix

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- Fixed error dict with nested validation
- Fixed Int/Float fields and not equals None
- Exclude tests from installation
- Allow tuples for index meta
- Fixed use of str in instance checks
- Fixed unicode support in transform update
- Added support for add_to_set and each

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- Fixed EmbeddedDocument db_field validation issue
- Fixed StringField unicode issue
- Fixes __repr__ modifying the cursor

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- Fixes scalar lookups for primary_key
- Fixes error with _delta handling DBRefs

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- Fixed inconsistency handling None values field attrs
- Fixed map_field embedded db_field issue
- Fixed .save() _delta issue with DbRefs
- Fixed Django TestCase
- Added cmp to Embedded Document
- Added PULL reverse_delete_rule
- Fixed CASCADE delete bug
- Fixed db_field data load error
- Fixed recursive save with FileField