Amazon app store support

[adrianthomas]

It would be great if this could also support the Amazon App Store environment.

[kwadkore]

I've been looking into this but don't have anything concrete yet. Take a look at OpenIAB (https://github.com/onepf/OpenIAB) to see how they determine which app store to use.

[tashemi]

To support Samsung market I have added custom method setMarketUri(string marketUri). Setted marketUri I use in the method _handlePositiveChoice(). Somewhere in the client's code I set up rmm.setRunWithoutPlayStore(true);