Removed _.bind for activate and finish

Prevent incorrect `this` pointer from being passed which can sometimes cause the wrong component to finish. This has never happend with activate but it follows the same logic so it was removed as well.

Fixes #4
Fixed wrong this pointer

Fixed passing of the wrong `this` pointer to collection components activating or finishing from a `ViewModelCollection` with the `apply` function. The `this` pointer was a ko observable that should have been evaluated before being passed