Test NodeJS 4, 6, 8, and 10

.travis.yml

@@ -54,7 +54,16 @@ matrix:
       dist: trusty
     - compiler: gcc
       os: linux
-      env: SWIGLANG=javascript ENGINE=node
+      env: SWIGLANG=javascript ENGINE=node VER=4
+    - compiler: gcc
+      os: linux
+      env: SWIGLANG=javascript ENGINE=node VER=6
+    - compiler: gcc
+      os: linux
+      env: SWIGLANG=javascript ENGINE=node VER=8
+    - compiler: gcc
+      os: linux
+      env: SWIGLANG=javascript ENGINE=node VER=10
     - compiler: gcc
       os: linux
       env: SWIGLANG=javascript ENGINE=jsc

Tools/travis-linux-install.sh

@@ -33,10 +33,8 @@ case "$SWIGLANG" in
 	"javascript")
 		case "$ENGINE" in
 			"node")
-				travis_retry sudo add-apt-repository -y ppa:chris-lea/node.js
+				curl -sL https://deb.nodesource.com/setup_${VER}.x | sudo -E bash -
-				travis_retry sudo apt-get -qq update
+				travis_retry sudo apt-get install -y nodejs
-				travis_retry sudo apt-get install -qq nodejs rlwrap
-				travis_retry sudo npm install -g node-gyp
 				;;
 			"jsc")
 				travis_retry sudo apt-get install -qq libwebkitgtk-dev