Updated database schema

Added foreign key relations & fixed pep8 errors
Removed *~ | Attempt at translation
Unused imports removed | pep8
Attempt at translation | compiled files for babel added
Merge branch 'develop' of https://github.com/hammadhaleem/fedora-college into develop
Update messages.pot
Merge pull request #10 from hammadhaleem/develop

Updated database schema , added foreign key relations  & fixed pep8 errors