Create referral/partner program

### Motivation:

Demand creates supply - so bounties are a driver for further success of **BountySource** service.
More bounties - more developers - more bounties again.
### Solution:

Please consider introducing referral/partner program by rewarding with part of the bounty those who leads bounties to **BountySource** service.
It will not cause fee increasing as referral reward could be split out of the **BountySource** service fee. Yes, it means that **BountySource** service will get less from each payment - but it also means that **BountySource** will get a lot more payments, so it will even increase profits.
It could serve as a first step forward #260 implementation and might help with #405 - so far so good.
### Key benefits of introducing referral program:
- **"Open-source-spirit-adequate"**: No obligations, everybody is free to voluntary do what he/she thinks appropriate: either proposing issues, or organizing crowd-funding campaign, or sponsoring bounties, or providing bugfixes - or enjoying the entire process and amazing software!
- **Profit**: Introducing referral system is money-making activity for **BountySource** project. What could be more exciting than having much money for making the world even better?
### There are several possibilities for such effort:
- **User-referral**: Either referral system in its usual meaning when new-comers are referrals forever of that one who invites them.
- **Bounties-referral**: Or referral is that person who posted a bounty and have been invited to crowd-funding of the issue by another user. In this case it means that referral is a bounty, not user.

My vote is for latter alternative.
### Key advantages of bounty-referral against user-referral:
- **Relatively simple initial implementation**: As initial effort we could make a referrer that person who created an issue at **BountySource** - relatively simple comparing to creating user-referral system from scratch.
- **Fair**: It is good start, although in long-perspective we should consider creating real referral system - something like "utm_source" to identify those who really leads bounties to existing (proposed) issues.

@bountysource Are you interested?
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