FIX #214: unicode rendering for ParamRole model

* .gitmodules: updated submodule django-flexi-auth to feroda repository (forked from seldon)
* submodules/django-flexi-auth: upgraded to commit
* requirements.txt: updated link to django-flexi-auth feroda fork

To update, you need to reinstall django-flexi-auth submodule.
In your (virtual)environmend it should be enough to write:

pip install -U -e git+https://github.com/feroda/django-flexi-auth.git#egg=django-flexi-auth

Conflicts:
	requirements.txt