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Initialise an instance.
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For a given project, get a dictionary mapping available versions to Distribution
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See if a URL is a candidate for a download URL for a project (the URL
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Find the most recent distribution which matches the given
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Initialise an instance.
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Return the URLs of all the links on a page together with information
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A locator which scrapes HTML pages to locate downloads for a distribution.
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Tell all the threads to terminate (by sending a sentinel value) and
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See if an URL is a suitable download for a project.
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Get the HTML for an URL, possibly from an in-memory cache.
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