comment editing and code cleanup.
comment editing and code cleanup.

derekjchow/models,tombstone/models,cshallue/models,tombstone/models,cshallue/models,tombstone/models,derekjchow/models,alexgorban/models,derekjchow/models,alexgorban/models,cshallue/models,cshallue/models,cshallue/models,derekjchow/models,tombstone/models,alexgorban/models,derekjchow/models,tombstone/models,alexgorban/models,tombstone/models,alexgorban/models