Detailed spec: auction & profit distribution

[agryaznov]

1. Described auction mechanics in detail

2. Only 1 ticket per bidding ETH address

   if we don't apply this rule, person who made several bids wishing only one ticket will get several tickets reserved to him, dropping out other people with lower bids

3. Added Profit Distribution formalized rules

4. For the sake of simplicity, we do not count costs explicitly in the contract. Costs are Organizer's risk, and are accounted in her revenue share rate.

5. We need to specify checkin process mechanics in detail. @xhipster @dearnadia please go ahead and write your vision of it here

6. We need to describe process of speaker approval in detail. What are the criterias? How we garantee that speaker's deposit do not affect the decision (taking into account the fact that ecomonically it actually should affect). @xhipster @dearnadia again, please go ahead and write your vision of it here