Update to new payout table
Minor changes
Add in Gemfile.lock
Update experiment system to support two conditions, using our new payouts table

The conditions are specified as the unique values for the condition_name column in the payouts table.
The payouts table determines the conditions.
Also, 'condition' is a reserved word in MySQL that isn't recognized by rails, so I can't use that column name.
Fix payoffs to use new table

This required passing in the round information, as payoffs vary by round
Also, use the get_payoff function in projects, rather than just recalculating it again