Merge pull request #159 from AnalyticalGraphicsInc/node-8-1.0

Update Travis to Node 8 (1.0 branch)

.gitignore

@@ -1,6 +1,7 @@
 # NPM
 node_modules
 npm-debug.log
+package-lock.json
 
 # WebStorm user-specific
 .idea/workspace.xml

.travis.yml

@@ -1,7 +1,6 @@
 language: node_js
 node_js:
-  - "4"
-  - "6"
+  - "8"
 script:
   - npm run eslint
   - npm run test -- --failTaskOnError --suppressPassed
@@ -9,4 +8,4 @@ script:
 after_success:
 ## We only need to run coveralls for one node version (doesn't matter which one).
 ## We also ignore publishing failures, since restarting an existing travis build would otherwise break.
-  - if node --version | grep -q ^v6 ; npm run coverage && npm run coveralls; fi
+  - if node --version | grep -q ^v8 ; npm run coverage && npm run coveralls; fi