Switch the Travis build to stages

Author: LaurentGoderre

.travis.yml

@@ -13,30 +13,42 @@ addons:
     packages:
       - docker-ce
 
-script:
-    - if [ "true" = "${SHELLCHECK-}" ]; then shellcheck *.sh ; fi
-    - if [ -n "${NODE_VERSION-}" ]; then ./test-build.sh $NODE_VERSION ; fi
-    - if [ "true" = "${DOCTOCCHECK-}" ]; then
-         npm i -g doctoc  &&
-         cp README.md README.md.tmp &&
-         doctoc --title='## Table of Contents' --github README.md &&
-         diff -q README.md README.md.tmp;
-      fi
-
-env:
-    - DOCTOCCHECK: true
-    - NODE_VERSION: '4'
-    - NODE_VERSION: '6'
-    - NODE_VERSION: '8'
-    - NODE_VERSION: '9'
-    - NODE_VERSION: 'chakracore/8'
-
-matrix:
+script: ./test-build.sh $NODE_VERSION
+
+jobs:
   include:
-    env: SHELLCHECK=true
-    addons:
-      apt:
-        sources:
-          - debian-sid
-        packages:
-          - shellcheck
+    - stage: Doc TOC Check
+      install: npm i -g doctoc
+      script:
+        - cp README.md README.md.tmp &&
+          doctoc --title='## Table of Contents' --github README.md &&
+          diff -q README.md README.md.tmp
+
+    - stage: Shell Check
+      script: shellcheck *.sh
+      addons:
+        apt:
+          sources:
+            - debian-sid
+          packages:
+            - shellcheck
+
+    - stage: Build
+      env:
+        - NODE_VERSION: '4'
+
+    - stage: Build
+      env:
+        - NODE_VERSION: '6'
+
+    - stage: Build
+      env:
+        - NODE_VERSION: '8'
+
+    - stage: Build
+      env:
+        - NODE_VERSION: '9'
+
+    - stage: Build
+      env:
+        - NODE_VERSION: 'chakracore/8'