Add currentUser service

app/adapters/node.js

app/adapters/user.js

app/app.js

app/components/nav/topbar.hbs

app/components/nav/topbar.js

app/models/node.js

app/router.js

app/routes/application.js

app/routes/authenticated/index.js

app/routes/authenticated/nodes.js

app/services/current-user.js

app/services/session.js

app/templates/authenticated/node.hbs

app/templates/authenticated/nodes.hbs

ember-cli-build.js

package-lock.json

package.json