Django-less

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- Add LESS_OPTIONS config variable.
- Use urlparse instead of posixpath to leave double slashes in urls.
- Raise exception on compilation errors.

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- Use hashlib instead of django.utils.hashcompat which is deprecated in Django 1.5
- Add `shell=True` to Popen arguments when running on Windows.

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- Add staticfiles finder to serve compiled files in dev mode

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- Add LESS_ROOT setting

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- Fix unicodedecodeerror with non ascii in less file

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- Switch to staticfiles.finders when looking up the files in DEBUG mode.