Fixed south migrations order

Signed-off-by: Vincent Fournié <vincent.fournie@epyx.ch>
Smoothen the first installation process

- Update README
- Removed username/password in default DB
- Added some Makefile targets

Signed-off-by: Vincent Fournié <vincent.fournie@epyx.ch>
Merge pull request #7 from vfournie/feature/smoother-first-install

Feature/smoother first install