Fix Travis build flakiness

[jedesah]

The Travis builds are failing because we never manage to pass the tests on all platforms. There does not seem to be any rhyme or reason about which platforms are failing so I am guessing it's some general flakiness, that may or may not be introduced by the fact that they are running in parallel.

In the mean time, it might be worth reducing the number of platforms to a single one and see if that improves things. A travis build that always fails is not very useful...

[ahjohannessen]

Perhaps shippable is an option - it understands .travis.yml files and is free for opensource projects.

[jedesah]

@ahjohannessen Thx for mentioning Shippable, had never heard about it before. @timperrett I don't think we have anything to loose activating Shippable for Remotely and seeing how it performs. This may very well be a Travis issue. What do you think?