Armstrong.dev

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- Support for Django 1.7

- **Backward incompatible:** Drop the COVERAGE_EXCLUDE_FILES setting
introduced in 2.0. Better to use the more universal .coveragerc file.

- Coverage task no longer sets branch, source and omit options. Not
duplicating those across Armstrong components was nice but using a
.coveragerc file is standard and will work more flexibly no matter
how Coverage is run.

- Update the South-based ``invoke create_migration`` to only work under Djangos
prior to 1.7 and otherwise direct to using native migrations.

- Explicitly declare MIDDLEWARE_CLASSES to remove Django 1.7 change warning.
Still use the Django default, only now use the new Django 1.7 value. This will
require updates to the env_settings.py of some Armstrong components but it
only effects development and makes the required middleware more obvious.

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- **Backward incompatible:** ``env_settings.py`` is required and contains
the settings that ``fabfile.py`` used to have. It is written in the normal
Django settings.py style of variable assignments.

- **Backward incompatible:** ``tasks.py`` is required and replaces the
previously required ``fabfile.py``. It no longer defines Django settings
(now handled in ``env_settings.py``).

- **Backward incompatible:** switched from Fabric to Invoke, so the ``fab``
command is replaced with ``invoke``.

- **Backward incompatible:** Lettuce testing support is gone.

- **Backward incompatible:** the Sphinx documentation command ``docs`` is gone.

- **Backward incompatible:** remove ``assertInContext``, ``assertNone``,
``assertIsA`` and ``assertDoesNotHave``. Some of these duplicated native
Python methods and the potential confusion was greater than the benefit.

- **Backward incompatible:** individual components need to specify the
``fudge`` requirement if they need it.

- **Backward incompatible:** Fix ``generate_random_users()`` and turn it
into a generator.

- **Backward incompatible:** remove ``concrete`` decorators. The Armstrong
standard practice is to use "support" models when necessary in testing,
which are much easier to use and understand.

- Setuptools is explictly used. This is not a backwards incompatible change
because anything installed with Pip was automatically and transparently
using Setuptools/Distribute *anyway*. We rely on setup kwargs that Distutils
doesn't support and that only worked because of Pip's behind the scenes swap.
This allowed us to remove boilerplate and better prepares us for Python 3
and perhaps even more simplifying refactors. Functionally though, this
doesn't change anything.

- Drop the atypical VirtualDjango in favor of the ``settings.configure()``
Django bootstrapping method.

- Bare minimum package requirements for as-fast-as-possible virtualenv
creation. Even Invoke is optional when running tests. Individual tasks
can specify package requirements and will nicely message their needs if
the package is not installed.

- Run any Django ``manage.py`` command from import or the CLI with
component-specific settings bootstrapped in.

- Run tests with arguments. Use any args that ``manage.py test`` accepts
to run only specific test cases, change output verbosity, etc.

- Coverage testing is ready for multiple environments at once (like with Tox).

- Use (and backport) the Django 1.6 test runner. This standardizes testing
in favor of the newest method so we don't need to be cognizant of the current
Django version as we test across multiple versions. Bonus: because the new
runner is explicit about test discovery, drop the ``TESTED_APP`` code.

- New ``remove_armstrong`` task command to uninstall every Armstrong component
(except for ArmDev).