Create a Twitter bot that posts all new activity

Per suggestion in IRC: https://botbot.me/freenode/bountysource/msg/5428419/

To begin with:
- [ ] New bounties

Bonus points to be tackled later:
- [ ] New fundraisers
- [ ] Fundraiser activity (Fundraiser X hit 50%, etc)
- [ ] Bounty activity (Bounty X was claimed, etc)

Also, per-project RSS (https://botbot.me/freenode/bountysource/msg/5429335/)
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