CONNT-34: Updated development environment set-up for functional test runs:

- Added instructions for downloading and unpacking Mozilla Firefox and
geckodriver.
- Updated development and testing requirements files.

CONNT-25: Updating appliction and project to use Django 1.6.x:

- Fixed tests to denote that ordering is not important in a number of
queryset tests.
- Replaced deprecated parameter name mimetype with content_type in views.
- Updated development requirements and setup script to depend on Django 1.6.x.
- Removed requirement for django-discover-runner, which is now incorporated
into Django itself and works out of the box.
- Updated development requirements to include pytz (needed for USE_TZ = True
setting).

CONNT-28: Updates to documentation, requirements handling, and minor fixes:

- Fixed syntax error in MANIFEST.in file for recursive-exclude.
- Merged the about section from documentation into the README file.
Documentation now references README file instead of duplicating the
data. Minor formatting and wording fixes were made as well.
- Updated Sphinx configuration to use same string for both release and
version (deduplicate it a bit).
- Added a new, develoment-related, section to the documentation. Describes
how to set-up the development environment, as well as some maintenance
tasks.
- Updated quickstart instructions so they actually work. Switched to
using the pip install from PyPI instead of repository.
- Introduced pip-tools use for the development requirements file.
- Switched to using more fixed requirements in the setup.py.
- Removed test requirements from the setup.py.