Test resources are being included in the AAR

[andrefrsousa]

Description: After integrating version 1.2.1 in a work project, I find out that multiple test-related resources are being included in the AAR and therefore in the final APK.

Expected behavior: Test resource should not be included in the final AAR

Source code: As an example, the following layouts are included in version 1.2.1 of the AAR:

Android API version: N/A

Material Library version: 1.2.1

Device: N/A

[drchen]

They are part of the unit tests associated with the library.

I'll check if we should exclude them.