updated docs for django shortcuts get_object_or_404 and get_list_or_404
removed duplicated method
Fix an error in get_user_document
Fixing typos
Add a test case for get_user_document
Merge pull request #426 from laurentpayot/Django_shortcuts_docs

updated docs for django shortcuts get_object_or_404 and get_list_or_404
Merge pull request #428 from devoto13/patch-1

Removed duplicated line for 'pop' method in documentation
Merge remote-tracking branch 'origin/pr/432'

Conflicts:
	tests/test_django.py
Merge branch 'master' of github.com:MongoEngine/mongoengine
Handle dynamic fieldnames that look like digits (#434)
Fix the ._get_db() attribute after a Document.switch_db()

Without this patch, I've got:

```
myobj._get_db()

<bound method TopLevelDocumentMetaclass._get_db of <class 'oneflow.core.models.nonrel.Article'>>

```

I need to `myobj._get_db()()` to get the database.

I felt this like a bug.

regards,
permit the establishment of a field with the name of size or other

Example:

# model
class Example(Document):
    size = ReferenceField(Size, verbose_name='Size')

# query

examples = Example.objects(size=instance_size)

# caused an error

"""
File ".../mongoengine/queryset/transform.py", line 50, in query
if parts[-1] == 'not':
IndexError: list index out of range
"""
Merge pull request #441 from Karmak23/patch-1

Fix the ._get_db() attribute after a Document.switch_db()
Dynamic Fields store and recompose Embedded Documents / Documents correctly (#449)
Merge branch 'master' of github.com:MongoEngine/mongoengine
Update AUTHORS and Changelog (#441)
Fixed slice when using inheritance causing fields to be excluded (#437)
Fix Queryset docs (#448)
Updated setup.py
Fixed dereference issue with embedded listfield referencefields (#439)