add admin ui support for constance keys as lists

fixes #54
Fix typo
fix basestring in python 3
i18n verbose_name_plural for admin home page
add translation for zh_CN
Merge pull request #60 from flisky/zh-cn

add translation for zh-CN
Merge pull request #59 from flisky/py3-fix

fix basestring in python 3
Merge pull request #56 from camilonova/patch-1

Fix typo
Merge pull request #57 from morlandi/master

Localization in Italian
Merge pull request #55 from IDCubed/master

add admin ui support for constance keys as lists
fix typo
Use app framework for initializing in Django 1.7
Merge pull request #68 from jonasvp/django1.7

Use app framework for initializing in Django 1.7, refs #64
Update admin.py

Fixing Issue #70
add Czech localization
Updated the build matrix.

I added Python 3.4 and PyPy and Django 1.6.
I also upgraded all minor versions of all Django packages.
Russian translation
Fix one case
Add translation to the app name
Merge pull request #76 from 1844144/master

Add russian translation