minetest/minetest — pull request #1663 by Mkaysi (2014-09-19 23:09:17+00:00)
Title: .travis.yml: fix possible issues

* use `pool.sks-keyservers.net` as keyserver as it's often more reliable than `keyserver.ubuntu.com` as you can see with Google.
* put script to multiple lines
* build out-of-source
* use two CPUs
* make seems to fail if $(nproc) is used unlike WeeChat. ZNC has same issue.
* mark build as failed if one job fails immediately without waiting for all builds to finish.
* this doesn't stop jobs that didn't finish before build was marked failed.