Sketch of switching client-side testing to phantom + tape.
Remove dummy assert.
Merge pull request #519 from mapbox/phantomjs-tape

phantomjs + tape
Uniqueify tmp paths.
Longer timeout on phantom tests.
Merge pull request #520 from mapbox/test-windows-eperm

Uniqueify tmp paths (fix EPERM)
De-indent the things.
Merge branch 'master' into manual-merge