Investigate runtime APK automated CI testing

[AndreMiras]

The idea would be to start doing basic run time checks on the APK and automate it in a CI environment.
One candidate could be https://github.com/calabash/calabash-android
Run time checks we want to do are mainly module importing to begin with.

[AndreMiras]

After some investigations, I could run @inclement unit test in a x86 Android Docker container.
Here the container https://github.com/agoda-com/docker-emulator-android https://github.com/budtmo/docker-android
I'll now try to see if I can build the Docker image in Travis then push & run the APK there

[AndreMiras]

For the record, implemented via #3221 and leveraging https://github.com/ReactiveCircus/android-emulator-runner