Thanks, @torbenbrodt! Assigning to @cramforce for review.

Looks great, thanks! A few comments.

thx a lot for your feedback, which I really appreciate. I think we got all changes implemented. Tests are green.

LGTM. Please rebase and squash commits and this is good to go.
https://github.com/ginatrapani/todo.txt-android/wiki/Squash-All-Commits-Related-to-a-Single-Issue-into-a-Single-Commit

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build failed because of timeout on ubuntu APT servers

Err http://us-central1.gce.archive.ubuntu.com/ubuntu/ trusty/main libprotobuf8 amd64 2.5.0-9ubuntu1
503 Service Unavailable [IP: 173.255.118.228 80]

can you please run travis again?

LGTM. Merging.