[QA] Browser tests failing because rubygems.org is down

[Željko Filipin]

Looks like they are back[0-1] and Dan has submitted a patch to install gems
from a local source[2].

Željko
--
0: https://status.rubygems.org/
1: http://uptime.rubygems.org/
2: https://gerrit.wikimedia.org/r/#/c/176818/
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