Third party dependencies from http://wave.alown.co.uk fail the build

[Yuri Z]

It looks like we have some third party dependencies server from
http://wave.alown.co.uk that are not reachable and fail the Jenkins build.
@Ali, can you take a look? Ideally, would be to replace the links to use
maven-central or some trusted third party...
https://builds.apache.org/view/S-Z/view/Wave/job/wave-small_tests/2088/console