make Django 1.7 migrations

delete old (south) migrations
make Django 1.7 migrations:
./manage.py makemigrations employee
./manage.py makemigrations reminders

Tested by applying them on the production DB (./manage.py migrate),
shown as ‘FAKED’ and the app works correctly.
Merge pull request #21 from futurice/make-migrations

make Django 1.7 migrations