Update the db_prep_ prototypes to work with Django 1.2+

Django 1.2 introduced multiple DB connections. And Django 1.4
removes the compatibility layer. Update our prototypes so we
work with Django 1.2+ or later.
Update version of py-moneyed required.

Actually the current development version is fine.
So that migration works, specify the default currency in text form.

It is already indicated later on but is easily missible.
Use cls.objects when we check for objects attribute, fixes issue #6
Merge pull request #7 from dekkers/fix-issue-6

Fix issue #6
Merge pull request #5 from akumria/jakewins-master

Update the db_prep_ prototypes to work with Django 1.2+
Fix Attribute error when model inherit manager

AttributeError: 'NoneType' object has no attribute 'get_query_set'
When a Model inherit from an Abstract one which implement a Manager.
In this case '_default_manager' is defined but equal to None
Merge pull request #11 from rach/master

Fix AttributeError when Model inherit a mager
Updated readme, closes #1, a year later :)
Added dependency on py-moneyed to setup.py
fix unexpected keyword argument 'frozen_by_south'
Add Serialization function

Adding serialization functionality per https://docs.djangoproject.com/en/dev/howto/custom-model-fields/#converting-field-data-for-serialization
Merge pull request #15 from benjaoming/master

Fix South problem
Merge pull request #17 from gcallaghan/master

Issue 9 Deserialization Resolution
Fixed import error in Django 1.5 for LOOKUP_SEP

Fix documented here: https://github.com/toastdriven/django-tastypie/issues/671
Quick cleanup
Merge pull request #20 from hank/master

import for LOOKUP_SEP in Django 1.5
valid django 1.3+ settings
Merge pull request #21 from FPurchess/settings

valid django 1.3+ settings
Upgrade requirement