Major updates for the submission of the paper

• Update to oTree v5.9
• Refreshing the page will no longer result in the restart of the application
• Improved configurability of the experiment (choose endowments for each round)
• Improved instructions

First official release

• Added possibility for random round payoff or accumulated payoff.
• Added possibility for training round that does not affect the final payoff.
• Fixed Bugs from the Testing phase
• Optimizations on design and instructions text
• Cleanup