v1.4: do not change the working directory

- fixes https://travis-ci.org/niccokunzmann/mundraub-android/builds/419386104#L1618

v1.3: tag commits as new releases

- related https://github.com/niccokunzmann/mundraub-android/issues/60

build-2018-08-22-20-46-06-b5ae884: updated source strings

- tx pull -a

build-2018-08-22-20-46-06-8593d72: updated source strings

- tx pull -a

build-2018-08-21-22-00-07-946aae1: add log output

- fixes https://github.com/niccokunzmann/mundraub-android/issues/58

build-2018-08-21-11-17-04-9af3a3e

Add link to android studio

build-2018-08-20-20-48-54-155fdec

add f-droid to the list of dependencies

build-2018-08-20-20-44-14-56a5c1e: add fdroid link

- fixes https://github.com/niccokunzmann/mundraub-android/issues/19

build-2018-08-20-19-19-10-5140e9b: half size of the images

- improves https://github.com/niccokunzmann/mundraub-android/issues/57

build-2018-08-20-19-10-57-0e09cf4: add screenshots

- fixes https://github.com/niccokunzmann/mundraub-android/issues/57