Create API for download statistics

[danirabbit]

In order to enable a dynamic landing page for AppCenter we probably want a way to get common lists like:

• [ ] "New". Just straight up sort by date published

• [ ] "Trending". This is probably something like apps with the most downloads in the last day. It should probably be a short time period to keep it changing a lot

• [ ] "Top Grossing". Most money made in the last month.

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[btkostner]

• [x] Trending needs to have better download tracking, so we can query things like "each day" or "month" instead of just having a flat number of downloads.

• [ ] Top Grossing means we need to track payments.