What's different in 2.0 from user|developer perspective

[akarnokd]

I've started writing up wiki pages for detailing what's the difference between 1.x and 2.x:

https://github.com/ReactiveX/RxJava/wiki/What's-different-in-2.0
https://github.com/ReactiveX/RxJava/wiki/What's-different-in-2.0-(draft)

Let me know what else to describe from a library user's perspective.

[JakeWharton]

Action1 has been renamed to Consumer ... ActionN is replaced by the Action1<Object[]> type declaration.

The latter presuambly should be Consumer<Object[]>

[akarnokd]

Closing via 2nd side: https://github.com/ReactiveX/RxJava/wiki/Writing-operators-for-2.0