ReactiveCocoa/ReactiveCocoa — pull request #1622 by jspahrsummers (2014-12-15 22:35:33+00:00)
Title: Remove references to “subscribers” and “subscription” from Swift APIs

This also renames:

1. `subscribeOn` to `evaluateOn`
1. `on(subscribed:)` to `on(started:)`

Resolves #1613.