Update travis config and update to node 8

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 node_js:
-- 6
-- "node"
+- 8
+- node
 env:
   - NODE_ENV=production
 install:
@@ -11,27 +11,27 @@ sudo: false
 cache:
   directories:
   - node_modules
-after_script:
-- |
-  # RELEASE_BRANCHES and NPM_TOKEN defined in Travis settings panel
-  declare exitCode
-  $(npm bin)/travis-after-all
-  exitCode=$?
-  if [[
-    # Execute after all jobs finish successfully
-    $exitCode = 0 &&
-    # Only release on release branches
-    $RELEASE_BRANCHES =~ $TRAVIS_BRANCH &&
-    # Don't release on PR builds
-    $TRAVIS_PULL_REQUEST = "false"
-  ]]; then
-    # Authenticate NPM
-    echo "//registry.npmjs.org/:_authToken=\${NPM_TOKEN}" > .npmrc
-    # Set version to timestamp
-    npm --no-git-tag-version version $($(npm bin)/json -f package.json version)-prerelease.$(date +%s)
-    npm publish
-    # Publish to gh-pages as most recent committer
-    git config --global user.email $(git log --pretty=format:"%ce" -n1)
-    git config --global user.name $(git log --pretty=format:"%cn" -n1)
-    ./node_modules/.bin/gh-pages -x -r https://${GH_TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git -d playground -m "Build for $(git log --pretty=format:%H)"
-  fi
+jobs:
+  include:
+    - stage: test
+      script:
+      - npm run test:lint
+      - npm run test:unit
+      - npm run test:integration
+    - stage: deploy
+      node_js: 8
+      script: npm run build
+      before_deploy:
+      - VPKG=$($(npm bin)/json -f package.json version)
+      - export VERSION=${VPKG}-prerelease.$(date +%Y%m%d%H%M%S)
+      - npm --no-git-tag-version version $VERSION
+      - git config --global user.email $(git log --pretty=format:"%ae" -n1)
+      - git config --global user.name $(git log --pretty=format:"%an" -n1)
+      deploy:
+        provider: npm
+        skip_cleanup: true
+        "on":
+          all_branches: true
+          condition: $RELEASE_BRANCHES =~ $TRAVIS_BRANCH
+        email: $NPM_EMAIL
+        api_key: $NPM_TOKEN