Automatic cleanup! (#54)

* Update travis config

* Update WCT config

.travis.yml

@@ -1,21 +1,26 @@
 language: node_js
-sudo: required
+sudo: 'false'
 dist: trusty
-before_script:
-  - npm install -g bower polymer-cli@next
-  - polymer install --variants
-node_js: 6
+before_script: []
+node_js: '9'
 addons:
   firefox: latest
-  apt:
-    sources:
-      - google-chrome
-    packages:
-      - google-chrome-stable
+  chrome: stable
 script:
   - xvfb-run polymer test
-  - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then polymer test -s 'default'; fi
+  - |-
+    >-
+    if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then polymer test -s 'default';
+    fi
 env:
   global:
-    - secure: ahgtHFWqjsRiKiGtnkthNYWM4tz+IcQoA8/kFk+aYXGbljeGHdtdDkaUUsedlTyMdfupCG+Wn0PssEWb6qGsUo3BP9LyfDHL/UEO5//llOWaNTSWr5ztDPgDvOawk6g1y8bmA/2R1Gifhhe1zcLySprzCNMVgq+NFRkKD3maiv8=
-    - secure: i2DBL7MR4aHWO8fRi5m0d8kfujeO8slLe0RIV98snzHnO7wm7q9Wtxmf6rFYKawib1KPe+c4+/sCyECVLHw4r0BBZrN602Qc/8O5WxEeCAjjjMrytGYEKFGhsJRAzzw/M8ZfM2FfHuGdhzkJSqLUqgmf2Nzsmehgw5aUEBRimBo=
+    - secure: >-
+        U9eM5fb0hFe+fSGxSYjdqePJDa8FXtrW73agG2tyq97DIRKgZt8S+BoVzINEqHcbd72K8ewseoJ3Gur962QnpNMN8Te5Iku+Lli7XYoNVHhUhiq4yl5sEfKkDd5cHLDJh43nRU9yy5f7SQ0G0pHV+hxbjlcphvqFjRaxhs2IQfI=
+    - secure: >-
+        CLP3Fkt8gmCZUMiOuj0VGcRNMT1o4ae5y/LRJV4TJjLMD/58iXkPhVQ+AZDUBKcHPYdKvlv0IbPTc4K5m2XDznS9ucwmVUiZgvnUhLC83OyQ9j3ZjS/lSNkRqCK1o1vtMUx5x+p3IfgStAL988ODGA2OsZzvsnWqfmkjsxcFiyA=
+install:
+  - npm install -g polymer-cli
+  - polymer install --variants
+cache:
+  directories:
+    - node_modules

wct.conf.json

@@ -1,5 +1,19 @@
 {
   "clientOptions": {
     "environmentImports": []
+  },
+  "plugins": {
+    "local": {
+      "browserOptions": {
+        "chrome": [
+          "no-sandbox",
+          "headless",
+          "disable-gpu"
+        ],
+        "firefox": [
+          "-headless"
+        ]
+      }
+    }
   }
-}
+}