A sample code for mixpanel(just a sample for check. don't merge)

Hi, @f2prateek , I wrote a  sample code to check if the data is sent to mixpanel. 
With this code, I see events are sent to Segment debugger console, but not to mixpanel. Do you have any idea why it's not sending the data to mixpanel?
I used Android Studio 1.0 rc( gradle 0.14.4)

I just wanted share the code I wrote, so don't merge this branch.
Thank you in advance.