Django-preserialize

Dropped support for 1.7 and below.

**Features**
- 11 - Support for Django 1.7

**Changes**
- Previously, serialization of `QuerySet` instances used the `iterator()` method to evaluate the query. However, this [forces re-evaluation](https://docs.djangoproject.com/en/1.6/ref/models/querysets/iterator) of the queryset even if the queryset was already evaluated. This change drops use of `iterator()` which prevents possibly redundant queries and re-instantiation of the underlying models objects. (10, thank you stargazer for reporting this).

**Features**
- Python 3 support!

**Features**
- The code is now (officially) released under the 2-clause BSD license (8)

**Bugs**
- Queryset prehooks no longer propagates to their models (9)

**Changes**
- Posthook functions now take the object instance as the first argument.
- Objects passed into the `serialize` are now guaranteed to return