pid from manage.py; DionaeaFR init script ; replaced mimetype content_type

Added a basic init script.
This script needs a pid file; I added this to manage.py.

Replaced mime type with content_type to deal with 
 TypeError: __init__() got an unexpected keyword argument 'mimetype'

Prerequisites: /var/run/dionaeafr & /var/log/dionaeafr must exist and writable your user.