Enforce a "Bounty Claim deadline" and reallocate the bounty if unclaimed

If an issue gets closed and the bounty goes unclaimed for an extended period of time, we should donate or reallocate the funds.

Questions:

How long should we wait for someone to claim the bounty? Is 30 days too short? 60 days too long?

Where should the money go? Options I'd prefer are:
- donate to the project the bounty was on, to be used by the team members
- to the "Bountysource Community Fund", which would be used either by the Advisory Board (https://www.bountysource.com/teams/bountysource-advisory-board) or by the Bountysource community at large
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