Refactor the Pooch class to make it easily subclassed about pooch HOT 4 CLOSED

Would be great to have an easier access to the filenames inside the registry.
Currently, we must search for them inside the registry dictionary, but we must convert the dict_keys to list first. This leads to ugly coding.

For example, if we want to get a list of every filename in the registry we must do something like this:

filenames = list(GOODBOY.registry)

Would be nice to have a more stylish way of doing it, something like GOODBOY.filenames.

from pooch.

@santisoler OK, that's something we could easily add as a property in Pooch. Maybe registry_files instead of filenames. Would you mind opening a PR for this?

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@leouieda I've just opened #42 for this improvement.

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Thanks! Merged

from pooch.