Upgrade to Vue CLI 3 / Webpack 4 (#22)

Fixes #19

src/app/.gitignore

@@ -1,19 +1,24 @@
 .DS_Store
-node_modules/
-dist/
+node_modules
+/dist
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
-test/unit/coverage
-test/e2e/reports
-selenium-debug.log
 
 # Editor directories and files
 .idea
+.vscode
 *.suo
 *.ntvs*
 *.njsproj
 *.sln
+*.sw*
 
 # Auth0 settings
 src/auth/auth0-variables.js