ci(travis): add build stages

.travis.yml

@@ -1,13 +1,69 @@
 language: node_js
 
-node_js:
-  - 'stable'
-  - 'lts/*'
-  - 6
+git:
+  depth: 5
 
-script: npm run lint && npm t
+cache:
+ directories:
+    node_modules
 
-after_success: npm i -D coveralls && cat ./coverage/lcov.info | node_modules/.bin/coveralls
+jobs:
+  fast_finish: true
+
+  allow_failures:
+    - os: windows
+
+  include:
+    - stage: Lint
+      os: linux
+      env: SCRIPT=lint
+      node_js: stable
+
+    - &test
+      stage: Test
+      env: SCRIPT=test
+      node_js: stable
+    - <<: *test
+      os: osx
+    - <<: *test
+      os: linux
+    - <<: *test
+      os: windows
+    - <<: *test
+      env: SCRIPT=test NODE=nightly
+    - <<: *test
+      node_js: stable
+    - <<: *test
+      node_js: lts/*
+    - <<: *test
+      node_js: 6
+
+    - stage: Coverage
+      os: linux
+      script:
+        - npm i coveralls
+        - npm t -- --coverage
+        - cat ./coverage/lcov.info | $(npm bin)/coveralls
+      node_js: stable
+
+before_install:
+  - if [[ $NODE == 'nightly' && "$TRAVIS_OS_NAME" != 'windows' ]]; then
+      NVM_NODEJS_ORG_MIRROR=https://nodejs.org/download/nightly/ nvm i node;
+    fi
+
+install:
+  - if [[ "$TRAVIS_OS_NAME" != 'windows' ]]; then
+      npm i -g npm@latest;
+    fi
+  - npm i
+
+script: npm run $SCRIPT
+
+# after_success:
+#   - if [[ "$TRAVIS_OS_NAME" == 'linux' ]]; then
+#       npm i coveralls;
+#       cat ./coverage/lcov.info | $(npm bin)/coveralls;
+#     fi
 
 notifications:
   email: false