Added item images when user choosing their item for exchange.
.DS_Store banished
Set up Rating model
Add comments to ratings
Deleted tests
Wip - user can mark item as sent.
User can rate user that requested the exchange.
User can mark the item was sent. Added booleans to Exchange model.
User can rate other user only once - atm can't update rating.
User can update rating for other user.
Ratings model calculates average of user's ratings.
Shows ratings for user that submitted an item.
Fix: form shows values of already given data.
Adds comment with rating and limits starts from 1 to 5.