CONNT-25: Updated documentation:

- Marked Django 1.11.x as the only supported Django version.
- Updated some copyright notices.
- Updated installation and quick-start instructions for use with new
version of Django.
- Removed unneeded warning about pip version.
- Updated instructions to emphasize that 'crispy_forms' must be
included in list of installed applications.
- Added dedicated section for upgrade instructions. Covered some
general principles and upgrade from 0.3.x to 1.0.x.
- Updated release notes.
- Added information about Graphviz being the external dependency.

CONNT-25: Updating application and project to use Django 1.10.x:

- Bumped Django version in both development/testing requirements files
and in setup script.
- Synchronised the test project with template for Django 1.10.x.
- Removed unused (deprecated)
django.contrib.auth.middleware.SessionAuthenticationMiddleware
configuration option from the test project.
- Removed unused (deprecated) TEMPLATE_CONTEXT_PROCESSORS
configuration option.
- Updated release notes.

CONNT-25: Updating application and project to use Django 1.8.x:

- Switched to using GenericIPAddress instead of IPAddress in models.
- Updated setup script and development requirements to use Django
1.8.x.
- Updated release notes.

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.

CONNT-32: Fix incorrect version requirement for Django Crispy Forms:

- Implemented test helper for verifying that no exceptions are thrown when
responses are being rendered.
- Updated all tests related to views that render responses to use the new
mixin.
- Updated development requiremnts to use correct version of package.
- Updated setup script ti require lower version of package.

CONNT-29: Implemented initial set of release procedures:

- Replaced versioning on default branch tip to "dev".
- Updated the release notes to include information about changes made
since version 0.2.
- Added initial set of release procedures, covering versioning schema,
instructions on writing release notes, release issue template,
backporting of fixes, releasing new versions.