Update the Vagrant box
Most notable changes are:
- Set swap only when virtualbox is used as the provider
- Set up GDK in the vagrant box after installation
- Update base docker image to xenial (16.04)
- Install yarn in the box
Other minor updates:
- Update ruby version to 2.3.3
- Use nodejs 6.x from a PPA
- Suppress runlevel warnings
- Specify noninteractive installs
Resolves #258 (closed), #188 (closed)
Edited by Matija Čupić