allow filters to be toggled independent from COMPRESS_DEBUG_TOGGLE about django-compressor HOT 7 OPEN

With the change I proposed in #30 that would be easy to do.

Splitting the process into the follow steps will allow for that find grained control:

1. Precompilers
2. Combiner
3. Compressor

Each step depends on the previous one, so you can for example always run precompilers, only do combining on the testing environment and do full compression on production.

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I proposed a separate process tag here: #17
@jezdez replied he implemented it in some different way, but I don't see this possibility mentioned in docs

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@emirotin See http://django_compressor.readthedocs.org/en/latest/settings/#compress-precompilers

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@jezdez do they work when compression is OFF?

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Yup.

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Oh, that's great, but then docs need fixing - currently it says

If the COMPRESS_ENABLED setting is False (defaults to the opposite of DEBUG) the compress template tag does nothing and simply returns exactly what it was given. 

I think it needs a bold disclaimer saying that files matched with precompilers are always processed.

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FWIW, I think introducing a way to pass COMPRESS_DEBUG_TOGGLE a callable is the way to go here.

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