Isotoma.recipe.django

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- Buildout now cleans up the django script where necessary.
- The recipe no longer depends upon Jinja2.
- Added a buildout configuration and empty project to the recipe as quick dirty
recipe test.
- Environment variables can now be added to the bin/django(.*) scripts allowing,
for example, the addition of os.environ['CELERY_LOADER'] = 'django'.

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- Capitalise Jinja2 properly in dependencies so that it can be pinned properly
- Added new option: "bin-on-path" which, if true, will add the buildout
bin-directory to os.environ['PATH'] in each django script.

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- Eggs were never being installed due to a bug that used the working set in
offline mode. Now we inherit from zc.recipe.egg.Egg which gives us a standard
working_set method for correctly determining working_set.

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- Fixed extra-paths bug where a blank extra-paths option would add the cwd.
- Made the recipe PEP-8 compatible.

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- Adds apps to installed apps in the settings
- Creates a test runner that can run the created apps
- Creates an initial setup.py for the app
- Creates a urls.py with sensible defaults, including serving static files in debug mode
- Creates a settings.py and production.py heirachy, to enable settings overriding
- Can download django from a specific URL
- Added extra-paths option to append paths to sys.path in the bin/django* scripts.

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- Ground up rewrite, to use the django egg, rather than downloading a tarball.
This has removed the ability to use the SVN trunk