Upgraded sql_query_executor gem version
Deprecated get and set_model_class to persistence_class and persistence_class= methods
Removed unused methods
Fixed uniqueness condition for result_set
Fixed tests
Deprecated set_save_in_memory method into save_in_memory=
Now result set keeps attributes even from string queries
Fixed grammar
Refatored association methods and added create_association method
Removed some missing pry calls
SqlQueryExecutor gem version upgrade