CONNT-25: Updating application and project to use Django 1.7.x:

- Updated test project to use the same base template as the fresh
Django project started with Django 1.7.x admin tool.
- Fixed deprecation warnings related to model forms not including
explicit list of fields to be included or excluded.
- Removed all South migrations, replacing them with native Django
migration.
- Updated release notes.
- Bumped Django version in setup script.
- Bumped Django version in requirements files.
- Removed South from both installation and development requirements.