Merge branch 'release-1.2.0' into dev
Prepare for next version.
Also use custom OkHttp client with private SSL context for retrofit.

- See commit 1be1a6ddea933c5f4f38d212775432c8cfbc413f.
Use new temporary access token for testing.
Make this version 1.2.1.
Merge branch 'release-1.2.1'