Conflicts:
	EditorialModel/model.py
	EditorialModel/test/me.json

Add the possibility to change the migartion handler of a Model
It will send changes one by one to the new migartion handler
so it can re-create the Editorial Model

 use it to re-run ME creation in a new Migration Handler

Now it has a EmField 2 django method

Added a fieldtype varchar to me.json
There is a bug with django fields default values

Adding the django migration handler

Added a patch to solve a bug in django/core/management/commands/makemigrations.py w/django/core/management/commands/makemigrations.py
See https://code.djangoproject.com/ticket/24735

Added Lodel/settings/migrations.py that I forget
Disabled the --merge option that was given to the makemigrations command by the MH

Code cleaning, commenting etc needed...

Some problems are still to solve (see the todo comments in EditorialModel/migrationhandler/django.py )