Ignored npm package-lock file as it is a uniqe to each system.

.gitignore

@@ -10,6 +10,7 @@ npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 lerna-debug.log*
+package-lock.json
 
 # Diagnostic reports (https://nodejs.org/api/report.html)
 report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json