Tools: wct-local is launching phantomjs on travis

[rictic]

e.g. https://travis-ci.org/PolymerElements/app-layout/builds/150077994

This is not what we want. phantom should be opt in on travis because its failures aren't a strong signal that anything is wrong, and if the other browsers pass we don't want to fail just for phantom.

[eugef]

Why not just disable phantom in wct.conf.json?

I need to run tests in phantom, but i could not because of the merged PR.

[eugef]

@azakus do you have any plans to re-enable PhantomJS support?

[stale[bot]]

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