0.7.0

[ci skip] update changelog for 0.7.0

remove xvfb-run

Update travis config to xenial

Merge branch '0.3.x'

Merge pull request #25 from Polymer/shadow-dir

Add build support for `:dir()` in Polymer 2+

Merge pull request #24 from Polymer/shady-unscoped-fix

fix transform of test file, only test unscoped dom in shady builds

Fix shady-unscoped styles and add tests

0.3.3

update changelog

add prepare step

0.6.0

update changelog