Starting Android support for Estimote beacons 

Hi. I started to implement the ranging feature for Cordova Android apps. I uploaded a simple demo on youtube showing that it's working. https://www.youtube.com/watch?v=nGMc3EUqSbQ

It's just a beginning, all the SDK features should be implemented. Feel free to review and share your comments.

I will have some later to do, like adding features like been able to know the bluetooth state (supported, not supported, on, off) from the JS.