Create backup of the download cache before deleting it #24

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embray wants to merge 2 commits intomdboom:utils/remove-cache-if-loading-it-failsfrom embray:utils/remove-cache-if-loading-it-fails

+119-31

Commits on Jul 6, 2015

Create backup of the download cache before deleting it (adds a new optional 'backup' argument to clear_download_cache). Also includes fixes to correctly determine the urlmap filename on Python 3, a…
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Add relevant changelog entries. [skip ci]
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