Update models.py

typo
bargaining game adjustments
fix context
Merge pull request #5 from oTree-org/trust-game

Trust game
Merge pull request #6 from oTree-org/bargaining

Bargaining
Update models.py

change description
Update models.py

change description
update bargaining instructions
Merge pull request #8 from oTree-org/bargaining

update bargaining instructions
trust: add result, bonus, total