Implement find sort and cursor sort with list. Also, stub out collection ensure_index and cursor close.
Implement find sort and cursor sort with list. Also, stub out collection ensure_index and cursor close.

chartbeat-labs/mongomock,magaman384/mongomock,drorasaf/mongomock,mdomke/mongomock,StarfishStorage/mongomock,akun/mongomock,julianhille/mongomock,vmalloc/mongomock,marcinbarczynski/mongomock