Fix a subtle bug with dates: default argument of functions are evaluated when the function is declared, not when it is called...

Signed-off-by: CapsLock <faimaison@legeox.net>

The admin form has an easily accessible "Today" button for date forms, so
there's no need to pre-fill the field with today's date.

Conflicts:
	coin/members/models.py

Move end date memship defautl value calcuation to an external method else django migration compute it at each makemigrations (and this change every day)

django-ldapdb have a bug when django ask for creation of test database. This is corrected in github but not in pip package of django-ldapdb. So, for the moment i've replacer then requirements by github egg
Fix django 1.6 depreciation about test runner. Add 1.6 default "TEST_RUNNER" settings.
Remove south related useless code un members model