Merge pull request #11 from BertrandBordage/master

Explicitely specify kwargs + update tests & docs.
Merge pull request #12 from BertrandBordage/master

When a field has choices, display the verbose version.
Merge pull request #13 from BertrandBordage/master

Displays verbose representations of foreign keys.
A workaround for dealing with #14
Merge pull request #15 from BertrandBordage/master

Handles empty ForeignKeys.
Merge https://github.com/chrisdev/django-pandas

Conflicts:
	django_pandas/io.py