Created abstract BaseBox and BaseConfig
key_group to unique_together in config model
Fix pep8 and typo in BoxConfig
./opps/core/models.py:132:1: F821 undefined name 'json'
./opps/core/models.py:166:1: F821 undefined name 'instance'
./opps/core/models.py:175:21: W292 no newline at end of file
Add choice 'template' in baseconf format
Add ugettext lazy on text models core base confing
Remove template type on base config