Change django version to 1.5.5
Added entity M2M FK to package and package conditon object
Adapted admin view and filters to "take care" of entities
Added editor and exclusive_editor attribut to package object
Modify deploy/admin.py file to handle editor and exclusive_editor fields
Added calculate_position method to calculate position of each entity and enable a better naming in the future
Fix permission on package list view for non superuser
Added Info message if user is not super user in package changelist view