switchMap and combineLatest missing

[benjamingr]

Nice work,

Arguably two of the most important operators are missing.

If you're not sure how to do a simple implementation I have one laying somewhere - it's basically flatMap but unsubscribing from the earlier subscription and only taking the elements from the last observable.

[nmuldavin]

Great feedback, you're right I think I'll only need to modify flatMap slightly to make switchMap happen. I'll get those both in shortly. Thanks!