Support for RxJava 2.0

[migelfn]

Hi, I've been using this library for a long time now and I think its really great.
Do you have any plans on supporting RxJava 2.0?

[eleventigers]

Hi @xdgimf, I have no current plans but it should be pretty easy to do. I will have a look at setting up a v2 branch asap however feel free to contribute if I don't do it in the next few days ;]

[mortada-codes]

I updated it to RxJava 2 .how to upload ?

[eleventigers]

@mortdatherobot I have created a v2 branch for this purpose, please open a PR against it.