fix #107 - Use Android_ID instead of IMEI

[aron-bordin]

Using Android_ID.
Do I need to add something else?

[Kovak]

An important observation:

[14:20] tito: use "from plyer.platforms.android import activity" instead of manually importing PythonActivity
[14:21] tito: otherwise the code will be broken when used in service
[14:21] tito: dessant: ie, use: https://github.com/kivy/plyer/blob/master/plyer/platforms/android/__init__.py

[aron-bordin]

PR updated. Please, when possible, let me know if it's ok now.

[dessant]

Looks great, but we missed to merge this before refactoring the facades. Could you please update it and add a versionchanged tag with a short mention of the change on android? It should be merged right after that.

[aron-bordin]

PR updated, check if it's ok

[dessant]

Thanks a lot. 👍