Android-23

Merge pull request #55 from nextcloud/android23

Use en_us as locale

Android22

Merge pull request #53 from nextcloud/android22

Android22

Android-21

android-21

wip

Android-20

Merge pull request #51 from nextcloud/android2

also download deps neccessary for lint

Android v25-1

latest Tools for v25

Android v25

Update Dockerfile for Android v25