Add back Android demo module

[mgsx-dev]

Jitpack changed their build system making android compilation failing with current Gradle version.

The android module has been temporarily disabled in order to build again.

Gradle migration is needed in order to get this module back in.

[mgsx-dev]

Gradle migration has been done so android demo module could be added back in. I no longer have device to test it, so i can't do it right now. Help would be appreciated.