Simplify Travis CI scripts, fix deploy

.travis.yml

@@ -3,8 +3,6 @@ node_js:
   - 6
   - node
 env:
-  - NPM_SCRIPT="test:unit -- --jobs=4"
-  - NPM_SCRIPT="test:integration -- --jobs=4"
   - NODE_ENV=production
 sudo: false
 cache:
@@ -14,23 +12,24 @@ install:
   - npm --production=false install
   - npm --production=false update
   - npm --production=false prune
-script: npm run $NPM_SCRIPT
 jobs:
   include:
-    - env: NPM_SCRIPT=test:lint
+    - stage: test
+      script:
+      - npm run test:lint
+      - npm run test:unit -- --jobs=4
+      - npm run test:integration -- --jobs=4
+    - stage: build
+      script: npm run build
+      skip_cleanup: true
       node_js: 6
-    - stage: release
-      node_js: 6
-      env: NPM_SCRIPT=build
       before_deploy:
+      - if: branch IN (env(RELEASE_BRANCHES))
       - npm --no-git-tag-version version $($(npm bin)/json -f package.json version)-prerelease.$(date +%s)
       - 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
-        "on":
-          all_branches: true
-          condition: $RELEASE_BRANCHES =~ $TRAVIS_BRANCH
-        skip_cleanup: true
+        if: branch IN (env(RELEASE_BRANCHES))
+        provider: npm
         email: $NPM_EMAIL
         api_key: $NPM_TOKEN