Add node and yarn to Goban's provisioning

[unnawut]

Issue/Task Number: T510

Overview

This PR adds node (required by jest) and yarn to support the upcoming Admin Panel front end.

Changes

• Added node.yml for nodejs installation
• Added yarn.yml for yarn installation

Implementation Details

• Yarn installation is the same way as other packages currently in Goban
• Nodejs's version pinning seems to have an issue. A nodesource contributor suggested using the deb flag to point to a specific .deb path instead

Usage

From your goban directory on your host machine, run vagrant provision. The provisioning should complete successfully and you should see the following tasks completed:

TASK [ewallet : install nodejs gpg key] ****************************************
changed: [ewallet]

TASK [ewallet : install nodejs] ************************************************
changed: [ewallet]

TASK [ewallet : install yarn gpg key] ******************************************
changed: [ewallet]

TASK [ewallet : install yarn repository] ***************************************
changed: [ewallet]

TASK [ewallet : install yarn] **************************************************
changed: [ewallet] => (item=[u'yarn=1.5.1-1'])

TASK [ewallet : install yarn dependencies] *************************************
changed: [ewallet]

Impact

Pull the latest commit. Run vagrant provision from your host machine.