- winston will use the max files setting if spelled correctly
- added logger for persistence logging (see next commit)
- added logger for persistence logging
Merge commit 'dfdbd564b8b6ba7d0cda662061d51252f55ece34'

# Via Nicole Rauch
* commit 'dfdbd564b8b6ba7d0cda662061d51252f55ece34':
replaced express.bodyParser by express.urlencoded because of deprecation
Merge pull request #460 from leider/master

added logger for persistence logging