Jinja2's FileSystemLoader converts forward slashes to os.path.sep
automatically by design. This results in failures when using
env.get_template() on Windows. This is a workaround to fix that.

Update the cookiecutter-dj-* names

This solves a problem where files in nested, templated paths would raise an IOError:
e.g. {{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/binaryfile

This also removes the requirements file from tox.ini (since it doesn't exist). Instead, deps are
specified explicitly.

Fix README logo URL so it shows up nicely on PyPI

Ensure no errors on .DS_Store files during generate_files(), #36. Treat .DS_Store files like any other binary for now and copy over.

Adding tests_required=['mock', ] to fix test_prompt invocation error.