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