pathagar: reload postgres only if pg_hba.conf has changed
pathagar: add python-psycopg2 ansible postgresql modeule requirement
pathagar: changes to allow custom settings

Install source code inside a folder. Use custom wsgi removing path and Django
settings environment variable manipulation.
pathagar: change task name
pathagar: checkout specific git version
pathagar: use 0644 mode
pathagar: use a more standard wsgi.py file
pathagar: add admin user fixture
pathagar: improve title
pathagar: remove commented tasks
pathagar: remove unused files